TOOGOO(R) C-C Chromatic Pitch Pipe w/ Note Selector & Case Musical Pitch Pipe helps you find exact musical pitch every time Chromatic Pitch Pipe are made with precision-tuned, heavy reeds giving you an exact standard A sturdy chrome plated, full octave circular type 'chromatic pitch pipe with rotary pitch selector Circular Pitch Pipe is ideal for most instruments and attractive supplied in the plastic case With A, B, C, D, E, F, G to select: Size of the Pitch Pipe: 6.4 (diameter) x 1.1(thickness)cm