Set of 4. These are commercially available clear magnets, painted with acrylic paint and finished with varnish. Strong magnets for attaching documents, memos, photos, etc. to refrigerators, lockers, and whiteboards. While the paint is sealed and varnished for durability, it may peel if dropped or strongly scratched. Diameter: 4 cm Materials: Magnet, Polystyrene The photo shows the finished product with varnish applied.