TRAINING MUSCLE STRENGTH: Spiky Ball is an office health product for keyboard workers, which can improve grip, hand endurance, flexibility and muscle tone. A hand therapy ball can be used for grip strength exercises, finger training, wrist muscles, assisting rehabilitation training after injury, and reducing stress. RELIEVE MUSCLE DISCOMFORT: Using a grip ball for exercise can reduce nodules and tightness, relieve muscle soreness, improve athletic performance, and increase flexibility. The soft massage ball can be used on your feet, back, muscles and fascia, thereby reducing muscle tension and discomfort, allowing you to have a soothing mood! SOFT AND ELASTIC MATERIAL: Hollow Spiky Ball is made of TPR material, which has excellent elasticity and strength, good hand feeling, hollow soft ball, and will not deform when pressed at will. Our massager is designed to provide just the right amount of flexibility and provide you with a good experience and feeling. RELAXING MASSAGER: Whether you want to relieve muscle soreness, plantar fasciitis, or want to do some triggering before or after exercise, our massage ball is designed to provide the best results. It is a Neck, back, shoulder, waist and foot and other trigger point action massage ball! SMALL AND PORTABLE: The Soft Spike Ball is small in size, light in weight, and has a pointed design. It helps to exercise fine and rough motor skills. It can also be used for massage. You can put it in your carry-on bag or suitcase. Suitable for use in gyms, homes, offices and fitness centers. Specification: Item Type: Spike Ball Material: TPR Hardness: Hollow Soft Ball Package List: 1 xSpike BallGrip Ball Note: Manual measurement, please allow 0.30.7in error.