Features： 1、Improve Grip Strength: Hand exercise ball is an office health product for keyboard workers to improve grip strength, hand endurance, dexterity, muscle tension and fine and gross motor skills. 2、Assist in Post Injury Recovery: Hand therapy ball allows for grip strength exercises and training of finger hand and wrist muscles. Assists in recovery from injury and reduce stress. 3、Reduce Muscle Pain: Exercising with these massage balls can reduce knots and tightness, reduce muscle pain, improve athletic performance, restore sore muscles, increase flexibility and greater movement. 4、Grasp Easily: Finger resistance ball has a durable non slip exterior, is made of TPR, odorless and safe. Lightly textured exterior provides a secure, non slip surface for easy grip. 5、Compact And Portable: Finger exerciser is small, light, and can be carried with you. It is very suitable for postoperative rehabilitation training and helps improve finger strength. Specification： Item Type: Hand Exercise Ball Material: TPR Diameter: Approx. 7.5cm / 3.0in Hardness: Hollow Soft Ball Package List： 1 x Hand Exercise Ball