Resonators and frame are of redwood. The blocks are vertical-grain Sitka spruce, mounted on foam rubber.
5 feet high (to the block level -- not including the music rack); 7.5 feet long. The longest block is 52 inches; the shortest 27 inches. The player stands on a riser 22 inches high. Eleven blocks ranging from the low cello C to the B-flat below middle C (approximately). Played with a variety of heavy and light mallets, bare hands (as in bongo drumming), felted sticks on the edges of the ends, and wire cream whippers.