Material: Foam, silicone, Hedgehog ball material is TPR Size: Tennis ball 6.7cm/2.64in, Rugby ball 8.3*5.6cm/3.27*2.20in, Hedgehog ball 12.6*9.3cm/4.96*3.66in. Color:As shown in the figure Product features: 1. Multi-function: This grip ball is not only suitable for exercising finger and arm muscles, but also for relaxing and recovering muscles, making it a functional rehabilitation training equipment. 2. Precise training: Grip balls of different hardness can meet the needs of different users, effectively exercising finger grip and arm muscle strength, allowing users to more accurately perform rehabilitation training. 3. Convenient to carry: The grip ball is small and lightweight, and can be used for exercise anytime, anywhere, without extra equipment. It is very suitable for indoor and outdoor use. 4. Comfortable to use: The grip ball's is smooth and comfortable to touch, avoiding hand discomfort and making users feel more comfortable and happy during exercise. 5. Multilevel training: As the hardness of the grip ball varies, users can choose different levels of compression balls for exercise according to their own situation, gradually increasing the strength of their fingers and arm muscles. Package includes: 1 pc Finger Grip Ball