2 years & up. An upgrade from the classic nesting toy, the extremely resilient and durable pieces in the Discovery Stackers - Rainbow Tall Arch set enhance open-ended play indoors and outdoors. The heightened arch shapes encourage children to explore relationships in balance and organic geometry. With vibrant rainbow colors, this arched set bridges the gaps between various play patterns and brings a new life to light play. Sets include 5 solid, arched pieces and double-sided inspiration cards complete with ideas for play, relevant vocabulary, and beautiful imagery. The tallest arch measures 6.9"L x 2.8"W x 5.3"H.