Used flat on the floor or upright against a wall as a group or as individual pieces. They can also be great for Communication and language development, Personal, social and emotional development, Imaginative play and Sensory play. Comprises (with sizes): sq. 1 x convex, 1 x concave, 1 x flat mirror pad x 40mm thick, 1 x plain 600x40mm pad.. Each piece connects to other with hook and loop fastener. 3 x large removable/replaceable mirrors.