The universal hand trainer is designed for a variety of instruments. It can also be used for finger strength exercises in daily life. Safely and conveniently build strength, endurance, flexibility and coordination, providing a complete strength training solution for fingers, hands, wrists and forearms. The tension of each finger is adjustable within 125kg. You can choose different tensions for each finger for a multi-hand fitness effect. Made of ABS+ latex material, soft design, comfortable pressing, will not hurt fingers. Durable and long-lasting. Extremely portable design, you can put it in suitcases, pockets, wallets, bags, etc., and use electricity anytime, anywhere. Material: ABS Grip strength: 125kg (adjustable tension) Color: Blue Features: adjustable tension, creative appearance, convenient and practical. Product weight : 201g Size: 26.5x15cm Scope of application: suitable for playing piano, guitar, musical instruments. Packaging includes: 1 x finger booster