Thank you for viewing. ※ This product is purple (not yellow). ※ Please check the actual product images and purchase only if you understand. This is a fitness item that can be easily used at home, perfect for adult dieting and core training. Features: Silent design for quiet use Soft hoop structure for a gentle feel on the waist Weighted spring for effective resistance Indoor use OK, unaffected by weather Ideal for adult fitness and lack of exercise Supports waist tightening with continued use Usage scenarios: Home training Dieting Core strengthening Lack of exercise relief Fitness habit Notes: Please use within a reasonable range when using for the first time. Discontinue use if you feel any discomfort or pain during use. Children should use under the supervision of a guardian.