The Sound Shapes® Circle Pack features five circular shapes in different diameters and colors with specific pre-tuned pitch relationships. Constructed with Acousticon® shell material, the Sound Shape®s® Circle Pack provides a wide range of five tones which can be manipulated for a variety of effects. Sound Shape®s® are easily stored, portable and stackable. Ideal for Recreational and educational applications. Available in 5-piece Circle Packs consisting of sizes: 6", 8.25", 10.5", 12.75" and 15" Circles in random colors. Beaters and mallets included.