Feature: 1. This tool can help you quickly expand your fingers and increase the span, suitable for beginners to practice musical instruments. 2. Can solve the problems that the fingers can not be opened when the instrument is played, and the chords are very difficult to press. 3. Stretching the ligaments can increase the strength, and the connecting rod has elasticity and toughness, making the fingers more flexible. 4. Made of high‑quality ABS material, it is resilient and resistant to stretching, and it is not easy to deform after long‑term use. 5. The musical instrument finger trainer is fixed with screws, which can be adjusted according to the span of the finger and fixed to a suitable position. Specification: Item Type: Finger Exerciser Ring Material: ABS + thick copper nut Inner Rod Material: Technology fiber inner rod + imported silicone sleeve Colour: Black Length: Approx. 20cm / 7.9in Application: Guitar, piano, guzheng and other musical instruments beginners. Package List: 1 x Finger Exerciser1 x Replacement Rod1 x User Manual