SIZES FOR PERFECT FIT: It is recommended to choose a surfboard strap that is equal to or slightly longer than the length of your surfboard. DURABLE AND TANGLE-FREE: This surfboard leash uses 6mm TPU cord for optimal strength and durability. Featured dual anti-corrosion steel swivels keep the belt spinning smoothly and avoid tangles. This is an all-around leash designed for small to medium waves. COMFORTABLE & NON-SLIP: Soft rubber ankle cuffs provide extra comfort and prevent chafing and blistering. Double wrap-around velcro cuffs are adjustable to ensure the cuffs fit snugly around the ankle and add extra strength and security to your ankle contact. SAFETY AND PROTECTION: The padded ankle cuff has a quick release pull tab so you can easily detach yourself from the board. Double bearing design, 360° free rotation. Size: 5mm, 6mm, 7mm Weight: 180g Quantity: 1pcs Material: TPU high elastic polyurethane, swivel joint 304/316L stainless steel Colour: Black Tail fabric: high-strength webbing + Velcro + nylon rope 4 sizes are free to choose.