Silicone sleeve that adds a smoother, more pleasurable feel to your pumping session;Advanced Sleeve fits securely around the opening of many penis pumps and enhancement systems;Made from a high quality, extremely hygienic material, the sleeve cleans up in a snap, and is hypoallergenic, perfect for sensitive skin;Fits up to 3/7.5 cm pump cylinder;Ships fast and discreet! Note: some items ship in bulk, sealed, clear bags.