Product name:Grip grip training device Product size about : 16*11cm/6.2*4.3in Spring diameter: (approx.)0.4cm/0.16 inches Strength: 5-100KG Product color: As shown in the figure Product material:PP+high carbon steel product features: 1. The size of the human body: With its anti -slip design and the shape of ergonomics, this hand grip enhancer is very suitable for improving the strength of the finger strength to a new level. Comfortable, safely suitable for all finger size. 2. Adjustable strength: Made of high-intensity thickening spring made of steel. Strength: 5-100kg This hand grip enhancer has unparalleled durability, rust-proof, wear resistance and solidity, and can be used for lasting. 3. Enhancement results: Maximize your grip potential through the handle enhancer. Through intelligent counting systems and clear LCD screens, training progress and results can be better understood. Every time you train, you push yourself to a new level. 4. Various applications: Use this adjustable hand grip enhancer to improve your gestures and flexibility. For finger and forearm muscles, it is very suitable for athletes, musicians and gamers. Its comfortable grip and durable design make it a must -have for your fitness routine. 5. Gift gift: Maximize your movements and music capabilities through this grip force. As a perfect training assistance for tennis players, baseball players, golf players and climbers, it can enhance your grip, endurance and agility. It also provides a great gift for fitness enthusiasts. Its wear -resistant design means that it can even deal with the most intense exercise. The enhancer aims to suitable for all fingers, so that you can better understand the progress and results of the training. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1 pc Grip grip training device