Adjustable - The adjustable resistance design is from 5 to 60 kg, which can increase or decrease the hand tension according to your needs, effectively exercising the flexibility of the hands, wrists and forearms. Counting function - the dumbbells automatically count, and the bottom of the trainer is equipped with a mechanical counter, which can clearly record the number of times you strengthen your hands and organize your training plan reasonably. Easily stored in your pocket or backpack, allowing you to exercise anytime and anywhere. Suitable for home, gym, office or for walking, watching TV, outdoors and traveling. Wide Applications - Improve finger strength and flexibility for guitarists, rock climbers, pianists, tennis, boxing, golf and fitness. It can reduce joint stiffness, release daily stress, and effectively exercise grip strength, wrist strength, forearm strength, etc. Perfect for athletes, musicians, climbers, golfers and tennis players, home, office, outdoor activities and travel. Note:1. Please allow some imperfections due to manual measurement.2. Due to different monitors, colors may vary, please understand.If your shipping information is incorrect, your order will be incorrect.