Welcome to yancrane2.vn 1.Squeeze Ball that will make you relaxed your hands. It made of Foam PU. 2.It allows the holder to exercise all of the cells effectively. 3.Exercises to strengthen the finger knuckles without injury. Do it to help relieve strained . 4.At hand and fingers that often occurs when you wake up. 5.It also helps the blood circulation in the hands. 6.The balls are also useful in the relief of stress. 7.If you feel angry, but do not know how to vent. 8.Flexible soft awesome stress relief squeeze venting balls. 9.Size is approx: Dia 6.3CM 10.Material: PU Foam Package include 1 x Squeezing ball