【Adjustable Headband with 360° Buckle 】Our Boxing Reflex Ball contains our time-tested non-slip, no headache, perfect fit every time headbands. You could easily adjust the length of your headband with premium velcro to fit perfectly around the head. The 360° buckle application helps solve the complex string-knotting problem during boxing and provides high-performance training..【3 Difficulty Level】(Black Ball : 20g,Yellow Ball:60g,Red ball :80g)Are you worrying about it's difficult to get the hang? The black ball is specifically designed to be much easier for novices. Once you could dominate it, change to the yellow ball or red ball. Watch out! The red ball is much more bouncy, and you may be knockout technically..【MAKE EACH DAY YOUR MASTERPIECE】 You want to IMPROVE reaction and hand-eye coordination, BURN calories in a destressing way or just DEVELOP boxing skills without getting hurt. We designed the MOST EFFICIENT punching reflex ball for your unique needs. Thanks to its multifunctionality, the headband wrap boxing speedball makes the burning of calories and destressing feel like a EXCITING GAME and you can practice ANYWHERE (home, office, park or gym). – WARNING: HIGHLY ADDICTING!.【PRACTICE ANYTIME and ANYWHERE 】 You don't have to go to a gym, strap the headband on, have fun and burn your body within 15-20 minutes! Perfect for work breaks or school breaks or even for the beach and the park, this focus punching bag will burn many calories and help you get fit!.【Lighter, Softer and Safer 】Our high quality reflex ball set is designed to be much lighter and softer than the other ball.So everyone can enjoy punching ball without any worries about hitting you'reself in the faces, eyes, noses, and fists.