Beautifully colored smooth wooden buttons in graduated sizes with slightly flattened surfaces for balancing and stacking. In the seven colors of the rainbow, the buttons are an open-ended resource that can be used by the very youngest of children to improve hand-eye coordination, learn about colour, develop logical thought and to enhance imaginative play scenarios. Diameter: 1.9", 2.6", 3.2", 3.75", 4.3", 4.9", 5.5"