Relieve Joint Pain-- This hand exercise balls is designed to relieve joint pain, pressure and muscle tension caused by computer work, basketball, badminton, etc. This product is small in size and super light in weight. You can massage your hands by squeezing, rolling, and pressing the ball anytime and anywhere Comfortable Touch & Fondle Admiringly-- This silicone exercise balls is made of high-quality elastic materials and textured surface, giving people a dreamlike and comfortable touch and bringing you a good mood Applicable to a Wide Range of People-- This hand stress ball is very suitable for training finger flexibility to fight stiffness, rehabilitation training, exercise hand muscles, and enhance hand strength. Suitable for rock climbers, bodybuilders, computer workers, badminton, table tennis enthusiasts and other people 5 Different Hardness Types-- This stress relief squeeze ball has five different colors for you to choose, and their hardness are slightly different from each other, specifically, they become harder in this color order: Yellow, Orange, Red, Blue, Green