This combination is perfect for nipple and genital torture. The non adjustable nipple clamps are edged with a removable rubber covering to reveal serrated edges (if your nipples can take it). These clamps are linked by a sturdy metal chain which also links them to one of 3 easily changeable metal testicle/cock rings (1.5, 1.75 or 2 inches in diameter) via a snap hook. Material: metal.