Size: 8.2 x 6.5 x 2.2 cm; Color：black
Material：ABS + Aluminum housing non-slip rubber pads steel spring
[Adjustment Force]: You can adjust the finger enhancer. Turning the screw clockwise will make it heavier. From the index finger to the little finger you can exercise every finger.
[Comfortable feel]: The buttons and bottom of the finger grip enhancer are equipped with soft and thick silicone pads which increase the friction and anti-slip properties
[Scope of application]: With this finger enhancer you can increase the strength of finger muscles required for musical instrument performance train hand joint movements and eliminate stress
1 x Hand Strengthener
Jia Hu 1Pc Guitar Finger Exerciser Grip Hand Strengthener For Musicians Or Physical Therapy-B08B412XXN