Affiliate disclosure: This article contains affiliate links. If you buy through a link on this page, we may earn a commission paid by the manufacturer, at no extra cost to you. Of the three devices compared here, we sell only one — ProExtender — so read our treatment of the other two with that in mind, and check our working: every fact below about SizeGenetics and Phallosan Forte comes from those makers' own official pages, and where a maker publishes something we could not verify on its own site (including one of the prices), we say so instead of printing it. That is the same documentary standard we apply to the product we sell — whose own review scores it 6.0/10 and whose flaws get their own section below.
Quick Verdict
These are three different machines for the same job. ProExtender is a basic rod-and-strap traction device at the lowest verified price of the three ($189), from an established maker whose paperwork has real holes: no published kit list, no named certification, conditional guarantee fine print. SizeGenetics is the regulated-medical-device entry — a rod system from a Danish manufacturer (Danamedic ApS) that publishes FDA-registered Class II status, a CE mark, a 6-month money-back guarantee and something neither rival publishes: a list of men who should consult a doctor before use. Phallosan Forte is the different technology — a vacuum bell on an elastic waist belt, wearable day or night, with the most completely published kit list of the three and the highest verified price (AUD 599 on the maker's Australian store). The traction evidence behind all three is the same class-level literature; no head-to-head trial between any of them exists.
At a Glance: ProExtender vs SizeGenetics vs Phallosan Forte
| ProExtender | SizeGenetics | Phallosan Forte | |
|---|---|---|---|
| System | Rod-based traction; glans held by silicone tube/strap | Rod-based traction with multi-way comfort/strap system | Vacuum suction bell + elastic waist belt (no rods) |
| Maker | Leading Edge Health | Danamedic ApS, Denmark (est. 1988; device launched 1995) | Phallosan (Swiss/German maker; facts from its official store) |
| Verified price | $189 Basic / $229 Deluxe (maker's current cart) | Not printed here — we did not verify a current price on the maker's own store for this comparison | AUD 599 on the maker's official Australian store |
| Guarantee / warranty | 6-month money-back — conditional (no refund if damaged; guide frames refunds around "diligent, documented use") | 6-month money-back guarantee (maker's stated headline; read its terms before relying on them) | 2-year warranty on parts, excluding sleeves and protector caps (maker's published terms) |
| Kit list published? | No full list on the order page; components named only in the usage guide | Sold in several packages; contents vary by package | Yes — full contents list published (belt, 3 bell sizes, sleeves, 2 protector caps, tension clip, suction ball, manual, measuring template, travel bag) |
| Certification published? | Implied, never named — no body, CE mark or FDA status stated | Yes — FDA-Registered Class II (US) and CE-marked (Europe), per the maker | Positioned as a medical device; certification detail varies by regional store |
| Maker's stated daily wear | 5–6 hours after a 6-week start-up (usage guide) | Extended daily wear; results framed around consistent daily wear time | At least 4–8 hours daily; maker says comfortable up to 12 hours, day or night |
| Curvature positioning | No direct claim on the homepage; Peyronie's listed as an indication in its 1998 study summary only | Explicit — markets curvature/Peyronie's use, with published doctor-first cautions | Explicit — markets curvature correction as a core use |
Design: Rods vs Vacuum
ProExtender and SizeGenetics are the same species: two rings joined by adjustable rods, traction read off marked settings — ProExtender's guide marks 1,200 g, 2,000 g and 2,800 g — with the glans held by a strap or tube. The design is simple, rigid and visible; it is worn pointing up or down under clothing, and its own guide anticipates soreness behind the glans where the strap sits. SizeGenetics layers comfort hardware on the same skeleton (its "58-Way Ultimate Comfort System" of interchangeable pads and straps) and states a clinically studied force range of 600–1,500 g — a notably more conservative ceiling than ProExtender's 2,800 g top mark, and worth a buyer's attention: more available force is not obviously a feature in a device class whose own guides warn against extremes.
Phallosan Forte removes the rods entirely. A vacuum suction bell (three sizes) grips the glans, a protector cap shields it, and an elastic orthopaedic belt worn around the waist supplies the pull — up to 3 kg, per the maker, regulated by a tension clip with a traffic-light colour scale. Because the penis is held against the body, the maker positions it for discreet wear under ordinary clothing and for wear "at any time of the day or night" — the one system of the three whose published design directly addresses the two situations (workdays, sleep) that rod devices handle awkwardly. The trade-off is consumables: sleeve condoms and protector caps are wear parts, and the maker's warranty explicitly excludes them.
The Paperwork Compared: Certification, Kit Lists, Cautions
This is where the three makers diverge most, and it is the ground our scores are built on. SizeGenetics publishes the strongest file: a named manufacturer with a company registration, FDA-Registered Class II status and a CE mark stated outright, clinical evidence presented with named studies, and — uniquely here — a published "who should consult a doctor first" list covering active infection or open wounds, penile implants, undiagnosed pain, clotting disorders or anticoagulant use, and conditions that impair healing such as uncontrolled diabetes. That list is what responsible device paperwork looks like.
Phallosan Forte publishes the most complete kit list — every component enumerated on its store page, down to the measuring template and travel bag — plus a defined 2-year parts warranty with its exclusions stated. ProExtender publishes the least: no full kit list on the order page (components can only be assembled from its usage guide), a certification implied but never named, no warranty duration, and no caution list at all — instead, homepage claims of "100% safety without injury" and a "completely painless" process that its own usage guide contradicts by anticipating soreness and warning "don't go to extremes." A buyer comparing documentation alone would not rank the device we sell first, and we won't pretend otherwise.
One lineage worth knowing, because both makers publish it: the surgeon both credit is the same man. ProExtender's maker says its system was developed by Dr Jorn Ege Siana, the Copenhagen plastic surgeon behind the 1998 study. SizeGenetics' maker says Siana co-invented its device with engineer Jes Bech Müller, with the patent filed in 1995. The two rod systems are, on their own makers' accounts, cousins from the same Danish source — which makes the difference between them a difference of current manufacture and paperwork, not of fundamental design.
Evidence: The Same Literature Serves All Three
No study compares these devices against each other, and only one device-specific study exists among them: ProExtender's 1998 report (18 men, 12 hours a day, +2.8 cm average erect gain, labelled "preliminary" by its own maker, no control group described — audited in Do Penis Extenders Actually Work?). Everything else is class-level: the Turin (Gontero) study of a different extender, the British Journal of Urology's 2008 assessment of extenders as a class, and the Peyronie's traction literature (Levine et al., 2008) that SizeGenetics cites in support of curvature use. Each maker quotes the class literature as if it were product evidence; it is not, for any of them. What differs is candour about the boundary: SizeGenetics presents the studies as support for traction therapy and publishes its regulatory status beside them; ProExtender's homepage converts its small study into a "100% success rate" and a girth figure its own results page does not state.
Price and Guarantee Compared
On verified numbers: ProExtender is the cheapest entry at $189 (Basic; Deluxe $229 adds two supplement bottles and free USA shipping, not device upgrades) — at the low end of the $100–$400 range the maker's own retail store states for extenders. Phallosan Forte is AUD 599 on its maker's Australian store — roughly triple ProExtender's entry price, for a different technology with published contents and a 2-year parts warranty. SizeGenetics' price we leave blank deliberately: we could not verify a current figure on the maker's own store while preparing this comparison, and this site does not print prices it has not verified at the source; third-party listings vary. On guarantees: ProExtender and SizeGenetics both headline six months — but ProExtender's own documents attach conditions (no refund if the device is damaged in use or assembly; its usage guide frames the refund around "diligent, documented use") that a buyer should read in full in ProExtender, Answered before treating the two six-month promises as equal. Phallosan's published protection is a warranty rather than a results guarantee — a different kind of promise, covering defects, not outcomes.
Which Should You Choose?
Choose ProExtender if price decides it and you accept its paperwork as-is: a functional rod system, an in-writing (conditional) 6-month guarantee, and the only device-specific study of the three — bought with a wear log started on day one and expectations set by the study, not the homepage. It is the device we sell, it scores 6.0/10 in our review, and its strongest argument is that $189 buys the same traction principle the literature studies.
Choose SizeGenetics if documentation and regulation decide it: named certification, a doctor-first caution list, and a manufacturer that behaves like a medical-device company — and especially if curvature is your concern, since it addresses Peyronie's explicitly rather than by implication. Verify its current package prices on its official store before comparing totals.
Choose Phallosan Forte if wearability decides it: the belt-and-vacuum design is the only one of the three built for discreet all-day and overnight wear, with the fullest published kit list — at the highest verified price, with consumable parts outside its warranty.
And choose none of them until you have read the wear-time reality in our hours guide: every system here demands hours a day for months, and the unfinished course — not the brand — is the commonest reason any of them "doesn't work."
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. This article is educational and is not medical advice.
Disclaimer: This article is for general information only and is not medical advice. Always consult a qualified healthcare professional before using a traction device, especially if you have a medical condition, penile curvature or pain, or take prescription medication. Individual results vary, and no result is guaranteed.
Last reviewed: October 2026
