【High Quality Material】Our hand guard is mainly made of high quality PP, the handle is covered with non-slip thermoplastic rubber to increase hand grip, and the stainless steel spring can easily withstand 60kg of pressure. 【ERGONOMICALLY】Our hand, finger, wrist or forearm strengthener is designed to properly fit any type of hand due to its ergonomic grip, light weight and size that fits all audiences. 【Counting Function】This function can record the number of repetitions from 0-99, and can also be continuously adjusted from 5-60 kg, suitable for both beginners and advanced users. 【Type of Use】 We think it's one of the best ways to complement any other exercise that requires forearm or finger strengthening, hand grip strength, and wrist rehabilitation or strengthening. It is also considered a highly recommended exercise to reduce stress at work or in any type of place or situation.