Description: Consistently using our products can effectively exercise finger grip, improve arm strength, and are also suitable for hand muscle relaxation. Definitely, our product is portable because it is compact and light, and it also has soft texture. And your palm also can fit the ball firmly without skidding, so that the force is even, and the elasticity is fine. It is made of sponge, is comfortable to use. There are two sizes of the product to choose from. Our product is suitable for elder. Item Name: Finger Exerciser Ball Material: Sponge Features: Finger Training, Waterproof, Portable Hardness: Round Ball About 20lb, Olive Shape Ball (dark Green-20lb, Dark Blue-30lb, Red-40lb)Size Details: Round Ball Diameter: 6.5cm/2.56"(Approx.) Olive Shape Size: 8.8cm x 5.6cm/3.46" x 2.2" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Finger Exerciser Ball Our product is suitable for elder. Consistently using our products can effectively exercise finger grip, improve arm strength, and are also suitable for hand muscle relaxation. Using our product can exercise finger grip effectively and improve arm strength effectively. It also can relax your palm by squeezing. Unquestionably, our product can be used for hand relaxation and arm strength improvement, it also can effectively exercise finger grip after you are consistently using our products. Continuous use of our products can effectively exercise finger grip strength, improve arm strength, and also suitable for hand muscle loosening.