This pack contains just the ChordBuddy device for classical guitars whose necks are wider than normal guitars - about 1-7/8 inch. inches. The instructional material and songbooks are part of the ChordBuddy Classical Guitar Learning System (HL#146970) that are sold as a pack. This device by itself can support classrooms settings where books are sold separately or if someone wants to test out the device on their classical guitar first to see how it operates. A ChordBuddy device for normal sized electric and acoustic guitars HL# 123875 is also available separately or in a pack.