Ergonomic Design :Adjustable design is more ergonomic, bring you imaginative comfort. Easy To Carry:The finger cots are made of high-quality and environmentally friendly materials, with strong toughness, not easy to damage, reliable quality, and can be used for a long time, practice, and use anytime, anywhere. Versatile:Perfect for finger speed training for Bass, Guitar, Piano, Banjo, all stringed instruments, brass and woodwind. Increase your finger strength with this grip strength trainer. Any skill level can become a better musician faster. Main Function: the guitar expander tool is mainly applied for finger practice for beginners of musical instruments, quickly extend your fingers, increase the span of the fingers and the finger strength, to help you better play your favorite instrument. Warm Tips: it is recommended to use 5-10 minutes as a group, and you can repeat the exercise after the fingers are completely rested; It may be a little uncomfortable to use them at first, but don't get discouraged, through a few days of practice, you will find a significant improvement.