Dilator set, sold as bulk, includes 3 sleeves that lock into the vibrating, multi-speed handle, plus a soft universal sleeve. Can be used for pleasure and to strengthen pelvic muscles. Requires 2 AA batteries, not included. Dimensions include: 3.5 by 0.75 in. (small sleeve); 4.5 by 1 in. (medium sleeve). 6.75 in. by 1.5 in. (large sleeve); and 4.5 by 1.5 in. (universal sleeve).