- // Features
* The knob can be turned to change the resistance
* It is designed for gripping to forearm, finger for flexibility.
* Strength the hand muscular endurance.
* Simple to use and easy to integrate into almost any training condition.
* Produced by Taiwan manufacturer with good quality.
- // Specification
Light: spring 2.5mm (yellow)
Medium: spring 3mm (pink)
Heavy: spring 3.2mm (blue)
Super heavy: spring 3.5mm (gray)