Designed specifically for LA Pump penis cylinders. Made to cushion the bottom of the cylinders while pumping, and provides the best seal while pumping at any pressure. This item works especially well for men with heavy public hair who do not want to trim the area for pumping. Made of high quality silicone.This cushion only fits cylinders sized 1.5 in. to 2.75 in. diameter, and only fits LA Pump penis cylinders. Not for use with vaginal, breast or nipple cylinders, or anything over 2.75 in. diameter. Sold as a bulk item without retail packaging.