★★Set of 3. Great value!★★ This is an essential item to prevent twisting and kinking of the wing's hand leash! (Especially since the loop cord on the wing itself cannot be replaced due to deterioration, preventing twisting is the key to making your wing last longer.) To use, simply insert it between the wing body and the leash cord. → ① Eliminates hand stress caused by leash twisting & ② Prevents leash breakage due to accumulated twisting! The swivel weighs only 13g (No impact on wings that are sensitive to weight!) Made of rust-resistant brass, Tensile strength is 200kg (according to the manufacturer), Size is 10 x 34mm, inner diameter of the hole is 6mm. Two high-strength 4mm black cords are included per set. You can also customize it with your favorite ones. As this is a personal sale, performance cannot be guaranteed, but I have been using it for 4 years without replacement. There is no breakage, deformation, rust, or sticking, and tangling at hand is drastically reduced during turns.