STRENGTHEN MUSCLES: This wrist exerciser is designed to improve strength, power and speed in the wrists, fingers and forearms. The MINIMUM TENSION is about 8kg, which is ideal for athletes, sportsmen, fitness enthusiasts, professionals, rock climbers, golfers and tennis players^ ADJUSTABLE DESIGN: Perform regular and reverse wrist curls with the adjustable stabilizer pad, instruction included. TRY IT AT THE MINIMUM TENSION FOR THE FIRST TIME TO USE.^ QUALITY & COMFORT: This wrist strengthener is made with heavy duty carbon steel springs and thick 10mm foam stabilizer pad (in comparison to 6mm) for extra comfort and cushion.^ PORTABLE & LIGHTWEIGHT: Compact size, easy to take on the go, to the gym, office or use at home.^ MORE BENEFITS: This wrist and forearm developer improves Hand Grip / Fingers / Forearms / Wrists Strength, and can also be used to Release Daily Stress and for Leisure Activities.