Note: This yoga ball with a gas distribution tube. If you blow it with your mouth, the size will vary._x000D_If there is a deviation in the size of the ball, you can use the air pump to refill several times to restore the original size. specification: Material: PVC_x000D_Weight: about 100g_x000D_Diameter: approx. 25cm/9.84 inch_x000D_Quantity: 1pc Features: 1Yoga ball: Ideal for use at home, in the office, gym and any other places you like. 2_x000D_Fitness equipment: Ideal to strengthen and tone the total muscle mass. 3_x000D_Improving balance: It helps to improve the balance and flexibility of the body and promote physical coordination. 4_x000D_Safety material: With the use of explosion-proof non-slip PVC material, no danger occurs during sport. 5_x000D_Lightweight: Small size, light weight, easy to carry, ready to use. PackageList: 1 x yoga ball