This is a black vegan leather BDSM bondage collar with a silver heart shaped o-ring in the center. Two chains are attached to the o-ring by silver chains that lead down to black rubber tipped adjustable nipple clamps. I bought this particular one because of the spikes protruding out of the vegan leather & the heart shaped o-ring. Very erotic! It's one size fits most as it's an adjustable collar. The chain length is not readily adjustable.