Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. specification: _x000D_Item Type: Reaction Ball_x000D_Material: Silicone_x000D_Product Size: Approx. 7 x 7 x 7cm / 2.8 x 2.8 x 2.8in_x000D_Product Function: Exercise hand-eye coordination, improve concentration, improve reaction ability Features: 1Made of high?density silicone material, safe and non?toxic, eco?friendly and firm, durable for use. 2Designed with six hemispheres, these reaction balls can produce dynamic and unpredictable bounces, convenient for training. 3It can be used on all hard surfaces or wall and can be used as an interesting way to improve the technique in exercises and training. 4These reaction balls are very suitable for enhancing your hand?eye coordination and can be used as rehabilitation and exercise tools. 5Light weight and in small size, easy to store and carry, suitable for different occasion, help train your movement speed and reflexes. PackageList: 1 x Reaction Ball