[Guitar Aid Tool]: Guitar Aid Assisted Trainer is for beginners to solve common problems such as difficulty in strings, inaccurate sound, and fatigue. [Easy Installation]: Teaching Practice Aid simply clips this learning tool to the neck of your guitar to install. Installation is simple and can be completed in minutes. [Multi Functional Application]: Guitar Aid Assisted Tool fits most 38inch/41inch acoustic guitars, making it a universal accessory for guitar learners. [Improving Efficiency]: Guitar Eletric System helps improve the efficiency of assisted conversion, helping you practice hand position and muscle memory, making your playing smoother. [Ideal Gift]: Guitar auxiliary artifact is an ideal gift for teenage and adult guitar lovers or beginners in the early of learning guitar. Colour:Black Material:Plastic Package Contents: 1x Guitar Aid Chords 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.