Great in Use: The guitar attachment features the extremely quick progression for a proven, effective guitar system, and it is suitable for all ages. Small Tip: This guitar attachment does not currently work on the left-handed, 12-string, classical or half-sized (childrens) guitars. Practical in Use: This guitar attachment only works on necks from 1 1/2, which will meet your needs. Useful Tip: Please measure your guitar neck before purchasing. If your guitar neck is over 1 7/8, you need the "classical guitar" version. Easy to Use: With the guitar tool, you can start playing from the minute you attach the practice aid to your guitar. Startplayingfromtheminuteyouattachthepracticeaidtoyourguitar. Extremelyquickprogressionwithaproven,effectiveguitarsystem,suitableforallages. Thisversionofthepracticeaiddoesnotcurrentlyworkonleft-handed,12-string,classicalorhalf-sized(childrens)guitars. Ifitislessthan11/2"theaidwillnotworkonyourguitar.Anditdoesnotcomeinanyretailpackaging. PLEASEmeasureyourguitarneckbeforeordering.Ifyourneckisover17/8"youneedthe"classicalguitar"version PackingList: 1xGuitarAttachment