Product description Size: 15.0 cm * 15.0 cm * 10.0 cm Color: yellow, green, purple Material: PVC Package content: 1* massage training ball 1. Help Blood Circulation : Foot Massage Ball A rough surface is good for massaging your skin to stimulate blood circulation, relax nerve endings, and increase body mobility 2. Comfortable: This yoga hemisphere is made of qualified PVC material, safe, pliable and comfortable 3. Multiple use: You can use the two sides of this product for different purposes. The upper rough surface is used for a foot massage, the lower surface is used for balance training 4. Relieve Your Tension: You can practice yoga with this foot massage ball, it can help you loosen up your muscles and relieve your tension 5. Feature: There are anti-slip circles on the bottom of this product, ensure your practice safety, and there is a gas nozzle, you can inflate it by yourself