The colour coded stoppers allow for quick identification on your harness, and their rounded edges make for quick, convenient removals from the snap gate. Each stopper is made with a durable aluminium head and a strong galvanised steel cable.Durable 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)size 1 4.3/9.1 mmsize 2 4.8/9.9 mmsize 3 6.1/11.4 mmsize 4 6.9/12.4 mmsize 5 8.4/13.5 mmsize 6 10.2/15.5 mmsize 7 11.7/16.3 mmsize 8 13.5/18.3 mmsize 9 15.2/20.8 mmsize 10 17.3/23.4 mmsize 11 20.1/26.7 mmsize 12 22.9/30.5 mmsize 13 26.4/35.1 mmsize 1-2 - 2kNsize 3 - 5kNsize 4-5 - 6kNsize 6-12 - 10kNTotal Weight - 456g