Stopper Set #4-13A full set of all sizes of Stoppers on a Micron carabiner to protect everything from tip seams to finger cracks. Black Diamond Stoppers are an essential for every trad rack, designed with a transverse taper that permits sideways placements in flares and shallow seams. Anodized by size, they're quickly identifiable and rounded edges make for easy removal. Each Stopper is equipped with a durable, galvanized steel cable.