WUZHOU Promotes hand health: Finger Strengthener Ball make fingers become stronger, can help elder add repetitions to reap additional benefits Convex: Whole body convex massage, high play antennae, moderate hardness, durable deep massage acupoints without wear and tear Four-finger: This finger ball is four-finger design, better fixed finger, prevent slipping Multifunctional: This strengthener ball can be grip training, finger training, hand back massage and so on Massage point design: Grip strength exercise can deeply stimulate massage the hand acupoints, but also can relax the muscles of the whole body, local massage Delivery Quantity: 1pc Package Contents: Only the above package contents, excluding other products. Size: 12.3*6.8*9.3cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) color: blue (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)