Developed for Japanese people: We developed the cutting shape that matches Japanese people. This ensures a very secure fit. HIGH FIT: 25mm wide secure Velcro strap and zinc parts inside the special weight provide superior flexibility and a secure fit that stays in place. Easy to wear: To provide stability when wearing it on your wrist, we have equipped rubber parts to secure the wrist to provide a sense of stability. This part makes it easier to tighten the magic wrist belt and prevent it from moving left and right. You can adjust the weight of 5 levels. By using 5 separate parts, you can adjust the size according to your strength and strength. We made sure that the weight can be easily adjusted and taken out. The contents of the toy have been carefully developed to ensure a gentle and high fit. The zinc content is uniformly and the size has been developed to make sure that the contents of the hamper is consistent. Spaces to write your names: When used in groups we have provided a space to write your name, so that you can distinguish them from each individual. It is also convenient to write on "○○ City Equipment" for example, when using it in administration etc.