11 piece set, based on a 20" module, offers unending gross motor experiences, color and shape differentiation, sewn in flexible mirrors for interaction and discovery! The 18"h triangle piece has mirrors on both sides. The universal hook & loop attachments allow for a myriad of configuration possibilities. Made of durable 14 oz vinyl. For ages 9 months to 3 years. Floor space as shown: 60"l x 60"w x 18"h.