It is made from the unmistakable SuperFlex TPR, which means it is super soft and flexible, yet firm enough to enhance the natural girth and length of your penis. The sling holds the tissue tightly together, making it a highly resilient element. You don’t have to worry about it slipping when you make a few movements. Each Butch shaft sleeve comes with a customized ball insert that allows you to adjust the fit and feel to your liking. The bullet insert is designed to 'lock' into the inner chamber, so you can adjust the tightness of the inner length on your shaft. Coat the inside with lubricant, slide your flesh in, and you're ready to go.