Multifunctional waist torsion disc rotating non-slip balancing board for students Waist torsion board: Our rotating waist torsion disc adopts 3D massage board to increase body flexibility. HIGH QUALITY: This fitness equipment is made of high quality ABS, with high elasticity, wear-resistant and stable. Waist torsion disc: waist torsion disc to exercise the waist can bear the load of 120 kg. Non-slip structure: stable and non-slip structure does not hurt the floor for convenient use. Low Noise: This compact reinforcement equipment is silent when training, suitable for adults, students, the elderly, etc. Specifications: Material: ABS size chart:27.5cm x 27.5cm x 4.5cm/10.83in x 10.83in x 1.77in Package includes:1 waist torsion disc note: Color may vary slightly due to the color calibration of each individual monitor. Please allow a little measuring deviation due to manual measurement.