YAJU Speed and control: the regular use of adjustable finger trainer supports the development of grip strength, endurance, coordination, speed and control in fingers and hands. Adjustable finger trainer is recommended by musicians (including pianists and guitarists) and therapists.YAJU [Rehabilitation] This finger trainer is not only suitable for healthy athletes and musicians. Exercising the fingers and hands helps to maintain flexibility, strength, agility and hand dexterity, and Finger Flasher can help relieve hand pain by strengthening and rehabilitating the support muscles of the hands to remove pressure from the joints.YAJU [Pocket size and lightweight] we guarantee that this lightweight finger trainer fits easily in your pocket. Whether on holiday or in the office, adjustable finger trainer can be taken anywhere.YAJU [MULTI-USE] This 4-button finger training device has been specially developed for many musical instruments such as guitar and trumpet. It also helps for your finger strength training.YAJU ProductYAJU Features:YAJU 1. High quality material The finger training device is made of plastic and aluminium. All devices are of high quality, have a fine machining and are robust and durable.YAJU 2. Ergonomic design silicone pad on the bottom with non-slip design, good elasticity, increases the finger comfort.YAJU 3. Function: the finger trainer is a good aid for practicing before the show or for warming up and maintaining the condition when you are not at your instrument.YAJU 4. Application: finger exercises for guitar, piano, etc., joint hand activities, recovery, improved agility and strength of the fingers.YAJU Use:YAJU The hand and finger grip trainer is not designed for musical instruments, but for hand practice and insulated fingers to make them stronger, more flexible and more coordinating.YAJU Each physical exercise starts with a lower resistance and slow exercises. Hold the training device in your hand and place your fingertip independently on the keys. Press the button down, hold the gesture for 3-5 seconds and then relax. Repeat this exercise 5-10 times. Slowly increase to 3 groups of 10 times (total 30 times) step by step. If you feel tired or painful, please stop training immediately.YAJU As with other physical exercises, too much or improper use of the device would cause muscle pain or injury. The speed of the exercise should therefore be slow and increase the frequency and resistance carefully.YAJU Product details:YAJU Material: ABS (Acrylonitrile Butadiene Styrene), non-slip rubber padsYAJU Dimensions: 9*7*2.5 cmYAJU Button: 4YAJU Colour: blackYAJU Weight: Approx. 62gYAJU Box contents:YAJU 1 x Finger Training Device