Product Size: 14.5cm Color: blue, all black, black and gray Material: main body PP engineering plastic + TPR handle plastic wrap + spring steel Package content: 1 * gripper 1. Hand trainer with counting function: With this function, the number of consecutive printing processes can be recorded between 0 and 99 each time it is used. Easily adjustable resistance range 5-60 kg. Perfect for beginners and advanced users 2. Hand trainer rehabilitation equipment: The hand trainer finger trainer set for the treatment of patients with hand injuries, tendinitis, arthritis, carpal tunnel and tennis elbow. Quickly strengthen targeted muscles without injury. 3.Hand trainer finger dumbbell large area of use: relieve your stress at the same time to increase the forearm strength and hand strength. The is a forearm training device for fitness, crossfit, climbing, bouldering, tennis, boxing, rehabilitation, guitar, etc. Whether at home, while traveling or in the office, our finger trainer is the perfect companion. 4.In pocket format - easy to transport: The ergonomically shaped handle of the Sporgo hand trainer is particularly comfortable and secure in the hand. Ideal for daily use, you can train and build up your muscles anytime and no matter where you are. Thanks to the special surface structure, our hand muscle trainer guarantees ideal handling without slipping 5.Ergonomic Design: The upgraded and widened handles are equipped with high-grade soft skin-friendly plastic pads to make you more comfortable