The guitar practice tool is easy to install in one clip.Hold down multiple strings with one click. Nine universal chords, F,BM,EM,C,AM,G,AM7,,D, with these chords, you can play more than 90% of popular . Adults or children, young or old, anyone can quickly and easily learn to play-guitar. Simple to use, just press the button with name, then you can play the chords of the easily. The guitar practrice aid is suitable for most of folk guitar between 38 inch to 41 inch. Colour:White Material:plastic+metal Package Contents: 1 x Guitar Learning Aid Tool 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.