Features: 1.We specifically designed it to be much lighter and softer than the tennis ball,and everyone can enjoy it without any worries about hitting yourself in the faces, eyes, noses, and fists as well, it's much safer. 2.It can help train your reaction, agility, punching speed, fight skill and hand eye coordination while providing an interesting workout. 3.The unpredictability of the rebounding ball,coupled with the intensity of your punches will burn out your arms, chest, shoulders and upper back, perfect for calorie burning and conditioning. 4.You don't have to go to a gym, strap the headband on,perfect for work breaks or school breaks or even for the beach and the park, this product will burn many calories and help you get fit. 5.Made of durable material,anti-wear,scratch-resistant Specification: Material: PU rubber Rope length:100cm(39.37") Ball diameter:5.5cm(2.17") Color:Red,Black Package including 1x Ball,1x Headband,1x Rope or 2x Ball,1x Headband,1x Rope