Description_x000D__x000D_The fact that the fingers can& 39;t be crossed often limits the improvement of the performance level, and insisting on training to improve the basic skills is the king. This span trainer is continually improved to help the player solve the problem of the fingers being unable to open and increase the flexibility. It can be carried around when you are free to play the piano/guitar.x000D__x000D_Features_x000D__x000D- Color: Blue.x000D- Material: Plastic.x000D- Size: 13.9 x 2 x 2.1cm.x000D- Made of material for durable and long lasting use.x000D- High toughness, elasticity, smooth surface, easy to clean, and constant.x000D- Scope: electric guitar, bass, ukulele, piano, saxophone, instrument keyboard_x000D_- Simple and light, easy to carry, practice anytime, anywhere.x000D- Improve finger span and flexibility, improve finger function and improve playing efficiency._x000D__x000D_Packing list:2 x Finger Expansion Sleeves