TheChainGang Donut Ball Stretcher Weight, Two Piece Surgical Steel Ball Stretchers Weights These 2-piece Surgical Steel Donut Ball Stretcher Weights are made exclusively for comfort and is the Worlds Most Comfortable Ball Weight. They are either 20, 30, 40, or 50 mm tall depending on your choice, and are now available in several different inside diameters for a comfortable fit. These 2 piece Surgical Steel Donut Ball Weights are made exclusively for comfort and is the Worlds Most Comfortable Ball Weight. Being Donut shaped it contours smoothly with your body, yet they are still stackable if you like to stack them. Ball Stretcher Weights are designed for male scrotum stretching, or for temporary sensations. The weight collar is worn directly above the testicles. Made of a highly polished 316LVM Medical Grade Surgical Steel which looks really awesome.