Rainbow Kids Wood Building Blocks, Deluxe Play SetVivid, exciting, way for children to learn and play with blocks! Smooth hardwood blocks, sized to complement classic block sets, feature transparent windows of strong plexi-glass in beautiful red, yellow, blue and green. Looking through colored panes transforms a child's world over and over again as the principals of light and color are discovered. Adds fun, beauty and dimension to block building! Set includes 42 blocks. Ages 3 and up.