3 years & up. A colorful addition to traditional block play, this set of 10 painted arches and 2 natural tunnels can be stacked and balanced as independent structures or integrated with other block play. They feature rounded edges and smooth surfaces with a matte finish. Enhance engineering skills when stacking and balancing them on each other. Arches measure 11"W x 3"D x 5.5"H and tunnels measure 11"W x 11"D x 5.5"H. Set of 12.