specification: Item Type: Elastic Grip Finger Power Ball_x000D_Material: TPR_x000D_Size: Approx. 8cmx4.5cm/3.14x1.77in_x000D_Hardness: Purple is Slightly Soft, Blue is Moderate, Gray is Slightly Hard Features: 1Simple exercises greatly relieve daily stress and increase the strength of your hands, forearms and fingers. 2It can increase hand flexibility, improve strength, prevent stiffness, and relieve joint pain of hands, wrists and forearms. 3It can help prevent mouse hands, reduce anxiety, and increase blood flow and circulation throughout the hands, arms and fingers. 4Widely used, It is a good hand exerciser for frequent office workers and mountain climbers, also very practical for stroke rehabilitation patients. 5The jelly Q bomb has a solid feel, soft and comfortable, and the finger mark design makes it more comfortable to hold. PackageList: 1 x Finger Ball