Delight your derrière and make your anal fantasies come true with these 4 sleek weighted balls that vibrate….naturally, simply add lube to the smoothly coated balls and they’ll be slick and ready for easy backdoor entry. Then gently pop the inside your quivering backdoor, at 1.25” wide, they fill you up and put gentle pressure on your prostate for intense sensation. The slightest tremble or movement delivers silent vibrations from the internal weights. You will never need batteries. Waterproof for wet and wild fun Free 5-piece prep kit. The balls are made of durable ABS plastic with a smooth, velvety coating.