This ball features high elasticity and durability, non-toxic and tasteless. It can be used as a unique and practical perfect gift. Beautiful and ergonomic design: round design with a textured surface that fits perfectly in your hand. It fits in the palm of your hand, preventing stiffness, increasing flexibility and relieving joint pain. Ideal for hand massage or wrist training. Three levels of hardness: soft, medium and hard. Suitable for adults, the elderly, teenagers, children, people with different hand sizes and grip strengths. Portable: Our balls are about 5.3 cm in size and lightweight. This is a very good size as you can put it in a pocket and take it out to squeeze when needed. Description: 1. Your hands are likely to get pretty sore from using your keyboard and mouse all day, and exercising your hands with these egg-shaped hand therapy balls can definitely solve the problem! 2. These colorful stress relief balls in three progression levels (10kg - 20kg - 30kg resistance) can improve finger and grip strength for athletes and musicians. It can also relieve some of the tension and anxiety. 3. Hand exercise balls are manufactured by an experienced factory using the highest quality thermoplastic rubber. They retain their original shape after being repeatedly compressed. Easy to clean and wipe with a cloth dry. Even after many years of daily use, they can retain their original condition. 4. These small, small and small balls are convenient for you and you can exercise with your hand at any time. When walking, traveling (car, plane, bus), in the office, at school, watching TV or any other place you want to exercise. Specification: Material: TPE (silica gel) Color: yellow, green, purple Note: 1. If you get a slight smell of printing, you can leave it in a well-ventilated place. When the smell is exhausted, you can safely use it. 2. This product is not suitable for children under 3 years old. You must be accompanied by an adult to use it.