2 years & up. The Colorful Wooden Rainbow Arches and Tunnels set is a vibrant addition to traditional block play. With 10 painted arches and 2 natural tunnels, children will love creating independent structures with these tunnels and arches, or incorporating them into their other blocks for endless building possibilities. Featuring rounded edges and smooth surfaces with a matte finish, these arches and tunnels are the perfect tool for enhancing early engineering skills and introducing concepts such as balance to children. 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.