Description: Ergonomic design of this sit-up aid, with thickened suction cups and reinforced support bar design, fit the heel force, strong suction, non-slip does not fall off, in addition, there is a curved design makes the force cushion does not rub the foot. Featuring removable and easy to install, this sit-up aid has two adjustable heights and a compact, lightweight one-piece design that helps you shape your waist and get in shape. It is constructed of ABS, TPR,silicone and hardware accessories material. The bottom diameter of the sit-up aid is 14cm. The length of the sit-up aid is 23cm, and the height is 16cm. It can be used at home or in the gym to shape your body. Item Name: Sit Up Aid Material: ABS, TPR, Silicone, Hardware Accessories Features: High Load-bearing, Two-position Adjustable, Ergonomics Size Details: Bottom Diameter: 14cm/5.51" (Approx.) Length: 23cm/9.06" (Approx.) Height: 16cm/6.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Sit-Up Aid 1 x User Manual