Small, handy, easy to use and very accurate, the guitar pitch pipes are a quick and easy tuning tool for when you're on the move. The six different mouthpieces represent each string of the guitar and reproduce the relevant note. Simply blow into the necessary mouthpiece and tune your guitar accordingly by ear to the note produced from the pitch pipe. Ideal for schools. - Simple to use and no batteries required. Notes: E-A-D-G-B-E