Set of 4. These are painted with acrylic paint on commercially available clear (pink) magnets and finished with varnish. Strong magnets for attaching documents, memos, photos, etc. to refrigerators, lockers, and whiteboards. The paint is sealed and fixed with varnish, but it may peel if dropped or strongly snagged. Diameter: 4 cm Materials: Magnet, polystyrene The photo shows the finished product with varnish applied.