A great pump for the whole hand and forearm muscles and ligaments. You have to try it for yourself!
Rugged and durable. The ball core is made of zinc alloy material without any vibration.
Easy to use. Mechanical design, no power supply required. The compact design can be carried anywhere, whether in the office, gym or at home, it can be used as a toy to decompress at any time, and it can also exercise arm muscles.
