The seat surface is comfortable and : the seat surface is made of original package reinforced PP plastic, high flexibility and constant bending Thickened fe: As an original brand of products, we ensure qualified materials and scientific structural design for users Widening and thickening wheel: Since we developed this product originally, the material thickness of the wheel has never shrunk and has always maintained the original quality. To provide users with conscience products The wide wheel is wear-resistant and anti-sinking inside to strengthen the muscles and bones strong and Double carbon steel bearings move smoothly, maintenance-free lifetime use, Manufacturer: MMHHHG