Feature: 1. Cross Finger Design: If the user's fingers are not flexible, the cross finger design can effectively prevent the ball from falling off. 2. Increase Finger Strength: Squeezing them to increase the strength and endurance of the hands, fingers, wrists and forearms. 3. Easily Exercise Anytime and Anywhere: Finger strengthening ball is light in weight and can be carried in a bag, suitable for many occasion, such as school, home, office, etc. 4. Wide Range of Application: Suitable for elderly rehabilitation training and muscle training. Especially suitable for people with ADHD, obsessive compulsive disorder, autism or high anxiety. 5. Excellent Material: Made of high quality PU sponge material, safe and eco friendly, slow rebound, soft and durable for long term use. Specification: Item Type: Finger Exercise Ball Material: PU Sponge Size: Approx. 11 x 10 x 7cm 4.3 x 3.9 x 2.8in Hardness: 20LB Purpose: Grip strength training, grip strength rehabilitation, leisure play Package List: 1 x Finger Exercise Ball Note: Please allow slight size error due to manual measurement. Thanks for your understanding.Excellent Material: Made of high quality PU sponge material, safe and eco friendly, slow rebound, soft and durable for long term use. Wide Range of Application: Suitable for elderly rehabilitation training and muscle training. Especially suitable for people with ADHD, obsessive compulsive disorder, autism or high anxiety. Easily Exercise Anytime and Anywhere: Finger strengthening ball is light in weight and can be carried in a bag, suitable for many occasion, such as school, home, office, etc. Increase Finger Strength: Squeezing them to increase the strength and endurance of the hands, fingers, wrists and forearms. Cross Finger Design: If the user's fingers are not flexible, the cross finger design can effectively prevent the ball from falling off.