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Sam has a 3 mm g-shackle (15 x 10 mm) and a 4 mm round rope.
Use a tape measurer to check your wrist size and select the right size. The sizes below are the circumvention of your wrist.
6.7″: Small / Medium7.1″: Medium (average male size)7.5″: Medium / Large7.9″: Large8.3″: Extra Large