Hand Grip Strength Trainer for Pianists Men Women Athletes Red Black Description: [Handshake Reinforcement]: This handshake reinforcement is made of PP, nylon and steel, it is strong, light and resilient; its thickened steel spring provides great strength without easy latching. [Ergonomic Design]: The finger exercise device fits comfortably in your hand, providing balance power distribution. Scientifically adjusts the strength of four fingers and hands for an effective workout. [Non-slip texture]: The grip enhancer has an anti-slip design that provides a comfortable grip that does not slip out of your hand during use. [Compact and Portable]: With dimensions of 16cm x 13cm / 6,30inch x 5,12inch, this hand grip trainer is small enough that you can carry it with you anywhere to comfortably use it at any time. [Wide Application]: Great for hand exercises, scientifically adjusting finger strength. Suitable for wrestlers, athletes, muscle builders and exercise trainers, whether they are beginners or professionals. Specification: Material: PP, nylon, steel Size Chart: 16 cm x 13 cm/6,30 inch x 5,12 inch The package includes: 1 Handle Amplifier