ach shape is a different color to teach colors identification. The set is designed to prepare your child for preschool with basic shape recognition, and kindergarten and beyond with more advanced shapes and colors. These magnets will stick to any standard metal surface (steel, i.e. fridge door, magnetic dry-erase board, etc) and are lots of fun to stack and build with! Guaranteed to provide tons of fun and educational play for your child, these magnets are a unique & beneficial gift for any munchkin!