A ball stretcher is a male sex toy that is used to stretch and elongate the scrotum. These devices are meant to wrap around the base of the scrotum and may come with attached cock rings.

Although ball stretchers are sometimes used during cock-and-ball torture scenes, many men also find the sensation of having their testicles gently pulled away from the body very pleasurable. Regularly using ball stretchers can also permanently elongate the scrotum, which is a look that some men and women find attractive

Please see picture for size