X4 Labs™ Extender Accessories

3600 Gram Minimum Tension Springs

Our specially calibrated 3600 Gram Minimum Tension Springs provide the lowest amount of tension offered by X4 Labs™. Our 3600 gram springs allow you to perfectly calibrate your tension to your ideal number.

If you would like to lower the traction of your medium or maximum tension Penis Extender this is the spring set you need. All springs are scientifically calibrated by X4 Labs™ to guarantee the perfect amount of tension every time.