Time-tested passive pro, Stoppers are a direct link to the original chocks that started the clean climbing revolution. 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. Stoppers  Durable aluminum heads and steel cables Transverse taper is versatile in flares, constrictions and parallel cracks Rounded edges for easy cleaning (smaller sizes are straight for better surface contact) *Sizes 1 and 2 are for direct aid only Tech Specs Dimension [Size 1] 4.3/9.1 mm (0.17/0.36 in) [Size 2] 4.8/9.9 mm (0.19/0.39 in) [Size 3] 6.1/11.4 mm (0.24/0.45 in) [Size 4] 6.9/12.4 mm (0.27/0.49 in) [Size ] 8.4/13.5 mm (0.33/0.53 in) [Size 6] 10.2/15.5 mm (0.40/0.61 in) [Size 7] 11.7/16.3 mm (0.46/0.64 in) [Size 8] 13.5/18.3 mm (0.53/0.72 in) [Size 9] 15.2/20.8 mm (0.60/0.82 in) [Size 10] 17.3/23.4 mm (0.68/0.92 in) [Size 11] 20.1/26.7 mm (0.79/1.05 in) [Size 12] 22.9/30.5 mm (0.90/1.20 in) [Size 13] 26.4/35.1 mm (1.04/1.38 in) Display 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 kN (450 lbf) [Size 2] 2 kN (450 lbf) [Size 3] 5 kN (1,124 lbf) [Size 4] 6 kN (1,349 lbf) [Size 5] 6 kN (1,349 lbf) [Size 6] 10 kN (2,248 lbf) [Size 7] 10 kN (2,248 lbf) [Size 8] 10 kN (2,248 lbf) [Size 9] 10 kN (2,248 lbf) [Size 10] 10 kN (2,248 lbf) [Size 11] 10 kN (2,248 lbf) [Size 12] 10 kN (2,248 lbf) [Size 13] 10 kN (2,248 lbf)