【HIGH QUALITY】Made with 100% high-quality Silicone free of BPAs, phthalates and latex. Our stress relief balls are strong, durable and safe. 【FUNCTION】Squeezing them builds strength and endurance in hands, finger, wrists, and forearms.Finger Strengthener Ball to progressively rehab a hand post-injury or post-surgery，fingers become stronger. 【PERFECT DESIGN】Hand Grip Strengthening Exercise ball for 2 Fingers, fixed more firmly.The size is suitable for most people, especially for Post-operative recovery & Physical Therapy. 【Exercise Easily】Finger Strengthener Ball are lightweight and you can bring them wherever you want in your bags, suitable for many occasions, such as school, home, office and so on. 【GOOD GIFT】It is also great for targeting muscles in adults’ hands and fingers. Help preventing tension, increasing limberness and alleviating joint pain.