Cock and ball torture is most exciting when you have plenty of time for a long and tantalizing build up. This CBT ball stretcher is made of soft, washable neoprene, which conforms to the body as it warms up, making it comfortable for long term wear. Soft rounded edges will not cut sensitive skin. Neoprene is a synthetic rubber that is safe to use with oil based lube and which is safer for those with latex allergies depending on the source of your sensitivity (please be aware that you can still be sensitive to neoprene if it is the chemicals used in the vulcanizing process that triggers your allergies, rather than the proteins found in natural latex itself. Nickel plated snaps adjust for a perfect fit. Circumference is 3.5 inches to 4.5 inches.