The Color Shakers are suitable for children of all ages, both because of their compact shape and their bright colors. As a set, they complement every educator's assortment and are also delightful for younger and older children at home. Even with a little wilder handling, the Color Shakers remain within a comfortable volume range. The set of 4 includes one of each color of our Color Shakers. The sound color ranges from bright (yellow) to warm (red), dark (green) to very dark (blue).