Check the listing for details. 2 Pcs Hand Exercise Balls Squeeze Balls Stress Ball Black. Condition: New with box. Listed at 9.89 USD. The hand exercise balls for hand suit people who type, drive, write, and climb mountains for a long time. You can use it anytime, anywhere: walking, in the office, watching TV, or other occasions. It helps reduce anxiety.SpecificationMaterial: RubberTotal Size: 5.7 x 4.2 cm / 2.24 x 1.65 inch (LxW)Maximum Grip Strength: 15 lbPacking List: 2 pcs x Squeeze BallsAdvantageReliable Rubber - The hand squeeze ball is made of rubber, which will not cause pain in the palms. The soft squeeze ball can maintain its shape, and the surface is slightly textured to provide you with a firm grip surface, which is tear-resistant and crack-resistant for long-term use.Decompression & Strength Enhancement - Simple exercises can greatly relieve daily stress in the hands, wrists, and forearms.