The Bumper Donut is part of the Bumper Thrust Buffer line up. Designed to work with the Bumper to reduce penetration depth of the penis, it can also be used by itself in a number of applications. When used, as intended, as an additional cushion for the Bumper, it can be stacked to create greater effect of penis length reduction. Made of our incredibly soft and stretchy SilaSkin material, a blend of Thermoplastic Rubber TPR and Silicone, it provides a large surface area for bumping into your partner. It can also be used on strap-ons to provide cushioning over the dildo harness attachment point, or a cushion on the shaft of silicone dildos. From Perfect Fit.