Rubberwood blocks with five different pitches for fun rhythmic play. When struck with a mallet the blocks sound higher or lower depending on their size. The smaller the block the higher the pitch. 12.5" ergonomically designed Mangowood base fits easily in your lap or on a table. Includes pair of wood mallets. 15 ply curved base constructed of environmentally friendly Mangowood with non-toxic clear coat finish and the blocks are made of Rubberwood with water based VOC free paint.