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Features: 3 Levels: The massage balls have different levels, red is high difficulty, blue is low difficulty, and yellow is massage hexagonal ball. Novices can also use it easily, the bounce ability of the balls can exercise eye-hand coordination, can also play a buffering role before exercise. Gift preparation: You can give the unpredictable bounce massage balls to family and friends who like sports, help them relax their muscles and their bodies after exercise. You can also give them to relatives, colleagues, classmates to help them practice reaction skills, show your care, and improve your feeling. Specifications: Material: rubber Color: red, blue, yellow Size: approx. 5.5 cm/ 2.17 inches Quantity: 3 pieces Package includes: 3 x Reaction balls Notes: Please allow slight deviation due to manual measurement. Please allow slight color difference due to different monitor.