Body-safe materials aren't just for vibrators, and the Pump Worx Silicone Power Pump is here to remind you. With a shaft made out of silicone, this is one tough pump that you shouldn't overlook. The simple design works for men of nearly any size. Simply place your member into the cylinder, through the squishy donut base, and begin pumping. As your member grows, you will be able to feel the textured nubbies along the interior of the cylinder, just for your please.