This is a reverse-grip assist belt. I purchased it new on Amazon. About half a month after purchasing it, both my daughter (first grade) and my son (preschooler) were able to do a reverse grip. We stopped using it soon after, but I kept it at home because it still works and it would be a waste to throw it away. My daughter, who couldn't do a reverse grip at all back then, can now even do a reverse grip in the air (without the assist belt). With this belt, they were able to do a reverse grip in no time. It seems that the belt, which allows children to grasp the feeling with their bodies, was easier for them to understand than having parents teach them various things. I would love to pass it on to those who are going to practice from now on.