Material: PVCWeight: about 900 gramsSize: Diameter: about 50 cm, height: about 28 cm 1Durable Material: The thickening non-latex non-slip, durable PVC material can carry a weight of up to 300 pounds. 2Improve balance: Inflatable donut balls can improve the strength, balance, coordination and flexibility of the core. 3Safe: Lightweight, 900g, safe, non-toxic and tasteless, no harmful substances. 4Flexible: It can be used as a training and fitness yoga device, as well as a nursery and family seat, as it is much more stable, flexible and interesting than the ball. 5Multipurpose: It is suitable for bodybuilding yoga, leg exercises, core training, stabilization yoga, balance training, stool and seats that can be used in the gym, office or classroom.