Black diamond stoppers are a direct link to the original chocks that started the clean climbing revolution.Anodized by size, they're quickly identifiable and rounded edges make for easy removal.Black Diamond Stoppers are an essential for every trad rack, designed with a transverse taper that permits sideways placements in flares and shallow seams. Each Stopper is equipped with a durable, galvanized steel cable.*Sizes 1 and 2 are for direct aid onlyDurable aluminum heads and steel cablesTransverse taper is versatile in flares, constrictions and parallel cracksRounded edges for easy cleaning (smaller sizes are straight for better surface contact) TECH SPECS Weight : [size 1] 7 g (0.25 oz)[size 2] 8 g (0.28 oz)[size 3] 15 g (0.53 oz)[size 4] 16 g (0.56 oz)[size 5] 18 g (0.63 oz)[size 6] 32 g (1.1 oz)[size 7] 34 g (1.2 oz)[size 8] 37 g (1.3 oz)[size 9] 39 g (1.4 oz)[size 10] 43 g (1.5 oz)[size 11] 51 g (1.8 oz)[size 12] 58 g (2 oz)[size 13] 71 g (2.5 oz)Strength : [size 1-2] 2 kN (450 lbf)]