Description: 1. Small size, no space, light storage space. 2. Thick soft foam, soft and comfortable, not hurt your feet. 3. Start with one key for three seconds. Waterproof and moisture proof, safer to use. 4. The third gear height can be adjusted freely. The comfort can be adjusted freely through the spring snap. 5. Strong suction, 14.5 cm in diameter, refuse to loosen. specification: Material: PVC + foam + stainless steel tube Sitting size: adjustable Features: fitness equipment, portable, suction cup, weight loss Color: black purple foam, blue black foam, pink purple foam, black black foam Package Included: 1PC * Sit-ups auxiliary equipment note: 1. Due to the difference in light and screen, the color of the project may be slightly different from the picture. 2. Due to manual measurement, please allow a difference of 0.5-2cm. wish you healthy