Description: 13 Guitar Bass Pitch Pipe . 13 chromatic scale can be played from octaves from C to C. Can adjust any provide any reference for the singer and vocalists. Precise tuning made of high quality materials durable and practical. Suitable for guitar bass violin etc musical instrument. Size Chart: Approx. 70 x 70 x 18mm / 2.75 x 2.75 x 0.71inch Package Includes: 1 Piece Pitch Pipe 1 Piece Case Box(Random Color)