The blocks are Brazilian rosewood and Pernambuco, mounted on thin foam rubber; the resonators are Brazilian bamboo.
40 inches high at the back, 33 at the front, 36 inches across the top. The 36 blocks are arranged in diagonal rows, so that one sweep of the mallet will sound an arpeggio-like chord. Strokes with the right hand are major; those with the left hand are minor (from top to bottom). The range is almost three octaves, beginning with the approximate C# above middle C.