1. The massage ball has interchangeable knots, just switch the contact points to target different muscle groups and get a comprehensive massage experience. 2. This massage ball improves your range of motion, promotes blood circulation, releases stress and stimulates meridian points to improve overall health. 3. Made of high-quality elastic material, it provides comfortable massage and relieves muscle soreness. 4. Three-in-one design, you can switch freely as needed 5. Material: TPE 6. Applicable scenarios: running sports, fitness equipment, health massage, fitness and body beauty 7. Product net weight: 154 grams 8. Note: Only massage balls are shipped, no other items!