LIGHTER, SOFTER and SAFER - We specifically designed it to be much lighter and softer than the tennis ball, so it is grove-free, and everyone can enjoy it without any worries about hitting yourself in the faces, eyes, noses, and fists as well, it's much safer!TWO STEP APPROACH LEARNING SYSTEM - 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 red ball. Watch out! The red ball is much more bouncy, and you may be knockout technically :)IT IS A PERFECT SOLO TRAINING EQUIPMENT- It can help train your reaction, agility, punching speed, fight skill and hand eye coordination while providing an interesting workout