You and 23 of your friends can each play one of the instruments from this set. There are six tone blocks, in three sizes; providing three different sharp pitches. There are six guiros, that crate a glissando of ratchet sounds; and twelve sets of claves that will keep the beat going. All the instruments are made of recycled plastic and can be played inside or out of doors. They are great for ensembles and in classrooms. Sets have two colors, green and cedar. Tone blocks measure 5.5 wide x 1.4 deep; the larger is 4.5 tall, the medium block is 4.25 tall and the smallest is 4 tall. The strikers are 7 x 0.7 x 0.7 inches. Guiros measure 7 x 1.5 x 1.5 inches. Each clave measures 7 x 1.2 x 1.2 inches.