Adopt 76*3Mm Top Quality Super Thick Tube With 12Mm Thick Steel Plate, Firm And Durable; High Density Sponge, Which Is Made Of High Quality Leather; The Link Gear Of Backrest And Cushion Is Suit For Exercises Requirement; Backrest Can Be Adjusted Arbitrarily By 0°, 15°, 30°, 45°, 60° Or 80°; Rear Carrying Wheels Are Convenient To Move. Function:Sit -Up