Durable material: Our grip strength trainer is made of PP, ABS, and carbon steel, making it durable enough to withstand daily use. Adjustable resistance: Turn the gray intensity adjustment knob to increase the resistance from 22 pounds to 220 pounds to meet your training needs. Portable size: The device measures approximately 16 x 14.5 cm (6.3 x 5.71 inches), compact enough to fit in your pocket. No assembly required, allowing you to start training anytime, anywhere. Main functions: Use our grip strength trainer to build hand strength, improve endurance, enhance finger flexibility, and strengthen the wrist, fingers, and forearm. Intelligent counting: The device features a built-in counter to track your repetitions, helping you monitor your progress. Press the button to reset the count. Specifications: Material: PP, TPR, carbon steel. Color: Black, green, blue (available options). Package includes: 1 x Grip strength trainer. Note: Please allow slight variations due to manual measurement. Colors may vary slightly depending on screen display. Please ensure your shipping address is accurate to avoid delivery issues.