This item is recommended for preventing twists and kinks in the leash attached to your wing or board! (Especially for the cord on the wing itself, which cannot be replaced due to deterioration, so preventing twists is the key to longevity.) To use, simply insert it between the wing or board and the leash cord. → ① Relieves 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, with an inner hole diameter of 6mm. A high-strength 5mm cord is included, but you can customize it with your favorite one. Sets of 2 or more are also available. (Set prices) 2 for 1400 yen 3 for 1800 yen ※ Cord colors are black or white. → Please comment in advance if you want multiple sets. (I will change the display and price.) As this is a personal sale, performance cannot be guaranteed, but I have been using it for 2 years without replacement. There is no damage, deformation, or rust, and it's easy to handle during turns, making it an essential item.