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 blocks made of Rubberwood with water based VOC free paint.