Rainbow blocks by Guidecraft are a vivid, 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 14 blocks. Materials: Hardwood, acrylic.Ages 3 and upBy Guidecraft