Mechanical counting , Do not have to count yourself. Help you focus on exercising. Finger exerciser: provide 4 pounds of resistance for each finger. Ideal for athletes, rock climbers, piano or guitar players to exercise the strength and agility of fingers, wrists, hands and forearms. Grip ring: Grip ring with medium resistance helps strengthen handle and reduce stress. Finger force band: Suitable for fingers of all sizes, enhance strength and flexibility of the fingers.