Purchased in the first half of 2024. I am selling these as I no longer need them, having acquired a more professional set. This is a ring-shaped grip strength training device. Suitable for active rest and rehabilitation. Each one is: Green 30lb (13kg) Blue 40lb (18kg) Orange 50lb (25kg) Gray 100lb (45kg) There are no issues with their use, but please understand that these are used items before purchasing. I am not accepting individual sales due to the high shipping costs. I will also not be lowering the price further.