18 months & up. Reflections are fascinating to young children. The colorful, reflective inserts in the Nesting Pyramid Mirror Set will entice, engage, and entertain young children as they explore and develop self-awareness. Encourage innate curiosities by using this set in conjunction with a light table, or using outside in sunlight. Rubberwood frames and shatter-resistant inserts make this set a durable addition to block play activities as well. One side features clear mirrors, while the other side has colorful mirrors.