This is a U-MAKES power grip. I previously purchased this here, but after consulting with my trainer, I've decided to switch my training to low weight, high reps. Since I'll be using gloves instead of a power grip for that, I no longer need it and would like to pass it on to someone who can use it. The original seller mentioned they used it twice. I've also used it twice, so it's been used a total of four times. The strap part is made of rubber and provides a very secure grip. In fact, it holds so firmly that it integrates with your elbow. For exercises like lat pulldowns, you really only need to rest your hands on the bar. This is highly recommended for those whose grip strength gives out before they reach their weight limit. Also, I think it's especially good for beginners to use, as it can help prevent issues like tenosynovitis. I don't think there are any stains, but there may be some minor scratches on the strap part due to it being a power grip. It also comes with the included mesh carrying bag.