Durable material: Our grip strength trainer is made of PP ABS and carbon steel, so it is039; It is durable enough to withstand daily wear and tear. Adjustable resistance: Turn the gray intensity adjustment knob to increase the handle from 22 pounds to 220 pounds to meet your requirements. Portable size: The size is about 16x14.5cm/6.3x5.71 inch. The grip trainer can be put in your pocket without installation, so you can start exercising indoors and outdoors. Main functions: use our grip strength trainer to develop strength, increase endurance, enhance finger flexibility and strengthen wrist, finger and forearm. Intelligent counting: The intensifier is equipped with counting function, which can track your training times and help you better understand the training progress. Press the button to clear the number. Specification:Material: PP TPR carbon steelColor: black, green, blue (optional)Package includes: 1 * Grip strength trainerNote: 1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding< br> 2. The color may vary depending on the display. Please understand< br> Note: Hello, please pay attention to your shipping address when purchasing products. If your receiving information (such as name, street, house number, doorbell/email without name) is incorrect, the order will not be delivered correctly.)