Features: 1. It is a grip strength trainer for adults a physical therapy ball for hand spasm arthritis and stroke a stress ball for mobile phone and computer enthusiasts and a squeeze ball for people with ADHD. 2. The football shape with four finger holes is more in line with the hand engineering design easy to hold suitable for the finger exerciser of most adults. 3. FRIENDLY DESIGN: Made of premium silicone material which is soft elastic and durable.There is no strong rubber smell and can be washed with water. Completely safe for children and adults. 4. EXERCISE SIMPLE:Small size can be put in a pocket elastic rebound quickly exercise finger grip strength. Easy to hold and convenient for fitness tools 5. ERGONOMIC DESIGN: The round shape for a comfortable fit in your hands .allows all fingers to be trained making the effect better.helps to disperse the stress points of the hand and achieve long-term training without pain. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Finget hole size: 2.2cm Body size: 9x6cm Grip: 10Ib includes: 1x Hand Grip Strength Trainer "