This listing is for the Nite Ize brand S-Biner SlideLock #3 in Black. The #3 indicates that it is of medium size and objects of up to 25 lb. (weight rating) can be hung from it; that means keys, key chains, key lights, keyless entry systems, or heavier items like silverware or water bottles. The S-shaped clip and its gates are made of stainless steel, and also has a slide-to-lock plastic locking mechanism that keeps items like the ones listed above from falling off clip. Is presented in retail card format.