Improve your grip, hand endurance, flexibility, and reduce muscle tension with these office health products designed for keyboard users. Using this grip ball for training can reduce knots and tension, relieve muscle pain, improve athletic performance, and increase flexibility. This hand therapy ball is perfect for grip exercises, finger training, and wrist muscle strengthening. It aids in rehabilitation after injury and reduces stress. Its small size, light weight, and spiked design help train fine and gross motor skills and can also be used for massage. Made of TPR material, it boasts excellent elasticity and strength, a great tactile feel, and a hollow, soft design that won't deform when squeezed at will. Item Type: Spiky Ball Material: TPR Hardness: Hollow Soft Ball Package Includes: 1 x Spiky Grip Ball Please allow for 0.3-0.7 inch error due to manual measurement.