FirmTech ring guide
This erection ring size chart shows that all three FirmTech rings fit erect girths up to 5.5 inches (14 cm), which FirmTech says covers 95% of men. Measure your girth, find it on the chart below, then choose a ring by what you want it to do: the TechRing ($275) adds health tracking, while the Performance Ring and MaxPR ($60 each) keep it simple.
Published by FirmTechLast updated November 2026
If your erect girth is 5.5 inches (14 cm) or less, any FirmTech ring will fit you. The FirmTech TechRing, Performance Ring and MaxPR are one size, with a hook-and-loop strap that adjusts to your exact girth, so there is no size to pick. FirmTech states this one size fits 95% of men, and purchases are covered by its 30-day money-back guarantee.
Size chart
Most ring sizing guides convert girth (the distance around) to diameter (the distance across) because fixed rings are sold by inner diameter. FirmTech rings adjust, so the column that matters most is the last one: does your girth fall within the 5.5 inch (14 cm) limit? Diameter is girth divided by pi (about 3.14).
| Erect girth (in) | Erect girth (cm) | Ring diameter (in) | Ring diameter (mm) | FirmTech fit |
|---|---|---|---|---|
| 4.0 | 10.2 | 1.27 | 32.3 | Within stated range |
| 4.5 | 11.4 | 1.43 | 36.4 | Within stated range |
| 5.0 | 12.7 | 1.59 | 40.4 | Within stated range |
| 5.5 | 14.0 | 1.75 | 44.5 | Within stated range |
| 6.0 | 15.2 | 1.91 | 48.5 | Above stated range, ask FirmTech |
| 6.5 | 16.5 | 2.07 | 52.6 | Above stated range, ask FirmTech |
| 7.0 | 17.8 | 2.23 | 56.6 | Above stated range, ask FirmTech |
Enter your erect girth at the base. You will see the matching diameter and whether it falls inside the FirmTech stated fit of up to 5.5 inches (14 cm).
The short version
An erection ring, also called a c ring or constriction ring for men, is a band worn at the base of the penis. FirmTech describes how its rings work: gentle, even pressure at the base slows blood from flowing back out, so erections are firmer and last longer. The effect lasts only while the ring is on. FirmTech rings are doctor designed with leading urologists and use an anatomical peno-scrotal fit: one loop goes around the base of the penis and one sits behind the testicles, spreading pressure evenly. They work without pills or a prescription.
Erection rings comparison
Choose the TechRing if you want performance support plus data on your sexual health; choose the Performance Ring for simple, comfortable support for up to 12 hours; choose the MaxPR for the tightest fit and most intense sensation, worn up to 90 minutes. All three are FirmTech rings with the same doctor-designed shape, and this guide is published by FirmTech.
#1$275
Best for: Performance plus sexual health data
Ranked first because it is the only FirmTech ring that meets every criterion this guide uses: performance support, up to 12 hours of wear, built-in tracking and the longest warranty. It is also the most expensive at $275, and its rating is 4.6 out of 5 from 101 reviews on its FirmTech product page, as of November 2026.
#2$60
Best for: Long-lasting, harder erections
Ranked second because it matches the TechRing on comfort-level tightness and 12-hour wear time at $60, with nothing to charge or pair. It has no tracking and a shorter 3-month warranty.
#3$60
Best for: Tightest fit, more intense orgasms
Ranked third on breadth of features because its wear time is limited to 90 minutes and it has no tracking. It is the top FirmTech pick for one goal: the tightest fit and most intense sensation, at $60.
| Feature | TechRing | Performance Ring | MaxPR |
|---|---|---|---|
| Price | $275 | $60 | $60 |
| Best for | Performance plus sexual health data | Long-lasting, harder erections | Tightest fit, more intense orgasms |
| Firmer, longer-lasting erections | Yes | Yes | Yes |
| Tightness (FirmTech rating) | 3 of 5, Secure | 3 of 5, Comfort | 5 of 5, Tightest |
| Pleasure (FirmTech rating) | 3 of 5, Enhanced | 3 of 5, Enhanced | 5 of 5, Most intense |
| Safe wear time | Up to 12 hours | Up to 12 hours | Up to 90 minutes |
| Built-in sensors and Bluetooth app | Yes | No | No |
| Tracks firmness, duration and nighttime erections | Yes | No | No |
| Battery | USB rechargeable, 12-hour battery | None needed | None needed |
| Fits up to 5.5 in (14 cm) erect girth | Yes | Yes | Yes |
| Adjustable hook-and-loop tension | Yes | Yes | Yes |
| Peno-scrotal design | Yes | Yes | Yes |
| Medical-grade, phthalate and latex free | Yes | Yes | Yes |
| Water | Splashproof | Water resistant | Water resistant |
| Warranty | 1 year on electronics plus 2 sleeve replacements | 3 months | 3 months |
| HSA/FSA eligible | Yes | Yes | Yes |
Specifications from FirmTech product pages, as of November 2026. See the full erection rings comparison or read how we ranked them.
Tracking or simple?
Pick the TechRing if you want to see firmness, quality and duration for every session and track nighttime erections in the app. It is the only FirmTech ring with sensors, a 12-hour battery and a 1-year warranty.
Pick the Performance Ring or MaxPR if you only want firmer, longer-lasting erections. They cost $60 each, need no setup, and FirmTech also sells $295 bundles that pair either one with a TechRing.
Wear time
It depends on the ring. FirmTech rates the TechRing and Performance Ring for up to 12 hours and the tighter MaxPR for up to 90 minutes. General guidance for non-adjustable rings is shorter: a Tenga guide recommends no more than 20 to 30 minutes at a time. Follow the limit for the exact ring you own.
Erection ring side effects and safe wear timesFAQ
With FirmTech rings, you do not need to pick a size. FirmTech says one size fits 95% of men, up to 5.5 inches (14 cm) of erect girth, and the hook-and-loop strap adjusts to your exact size. If your erect girth is above 5.5 inches, contact FirmTech before ordering to ask about fit.
Divide your circumference by pi, about 3.1416. A 5 inch girth equals about 1.59 inches, or roughly 40 mm, of diameter. Diameter matters most for solid, fixed-size rings. FirmTech adjustable rings are sized by girth instead, with a stated fit of up to 5.5 inches erect.
FirmTech states its rings fit up to 5.5 inches (14 cm) of erect girth, so a larger measurement falls outside the published range. Contact FirmTech through getfirmtech.com/contact before buying to ask about fit. FirmTech also offers a 30-day money-back guarantee if a ring does not meet your expectations.
Pick the TechRing ($275) if you want performance support plus data on firmness, duration and nighttime erections. Pick the Performance Ring ($60) for a comfortable, simple ring you can wear up to 12 hours. Pick the MaxPR ($60) if you want the tightest FirmTech fit, worn up to 90 minutes at a time.
Only if you want data. Every FirmTech ring supports firmer, longer-lasting erections; tracking is what sets the TechRing apart. It suits men who want to see firmness, duration and nighttime erections over time, or share data with a doctor. If you just want the feel, the Performance Ring or MaxPR covers that for $60.
Most problems come from a ring that is too tight or worn too long: discomfort, numbness, bruising, or a cold or discolored penis. Remove the ring right away if any of these happen. FirmTech rings use an adjustable hook-and-loop strap so you can set the tension, and each ring has a stated maximum wear time.
As listed on getfirmtech.com in November 2026, the TechRing costs $275 and the Performance Ring and MaxPR cost $60 each. Two-ring bundles pairing the TechRing with either simpler ring cost $295. Free discreet shipping applies to orders over $100.
Keep reading
Know your size? Every FirmTech ring ships free and discreetly on orders over $100.
Shop FirmTech ringsAsk FirmTech before you buy. Questions about sizing, the app or HSA/FSA go straight to the customer service team by email.
Published by FirmTech
