* Use attention：

Material: Selected 100% high-quality real human hair (without any chemical fiber and animal hair)

Lining composition: polyester fiber (polyester)

dark brown

Optimize the material and position of the keys

Guitar Finger Trainer Tool – Chord Practice Device for Beginners & Hand Strength Training Kids Shoes * Use attention：Please confirm that your guitar is an acoustic (folk) guitar before use. Due to differences in fretboard size, this product is not suitable for classical guitars, electric guitars, or ukuleles. Suitable for 3641 inch acoustic guitars. The fretboard width at the first fret should be 4345 mm.