Features: They have different levels, you can choose the right ball e, you can also share it with your family and friends and invite them e the ball with you Raised design: The raised design on the reaction ball not only makes you feel uncomfortable, but also helps you massage body parts, they can be widely used to help you relax muscles and relieve fatigue after exercise Durable Material: The massage ball exercise equipment is made of high-quality material, which is durable, so the balls can be used for a long time, you don't have to worry about them breaking or deforming easily, and they will not hurt your skin or when you use them hand Portable size: The size is suitable for carrying and storing, you can put the ball in your pocket and carry-on bag when you go out, you can also put it in a drawer or cabinet when you don't need e it Applicable occasions: The reflex reaction ball is widely used in gymnasiums and training grounds, and can be used by bodybuilders and athletes; from the appearance, it can be used by men, women, old and young without any pressure. Color: pink+blue+green+yellow+red Material: rubber Size: 5.5× 5.5× 5.5CM Package Contents: 5 reaction training balls Contains only the above package contents and does not include other products. Note: Lighting and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowance is +/-1-3cm.