18 months and up. Reflections are fascinating to young children. The reflective inserts in the Nesting House Mirror Set will entice, engage, and entertain young children as they explore and develop self-awareness. Encourage innate curiosities as children stack, sort, nest and explore. Rubberwood frames and shatter-resistant inserts make this set a durable addition to block play activities as well. Largest piece measures 10"W x 10"H x 7"D.