... white, red, yellow, blue, black, and more surfboard leash Size available at 6, 7, 8, 9, ... TPU strap; stainless steel joints; double swivelHardness (shore): up to 90 Specific gravity: 1.20g/CBM Resilience: ... 40% Ultimate elongation: up to 450% Tear strength: up to 80N/mm surfboards material: epoxy ... requirements.Welcome to get more informations. surfboard Leash/Stand Up Paddle Leash