The entire back of each magnet is covered with a strong magnetic material, ensuring a secure hold on any metallic surface. Made from 20 mil (0. 5 mm) flexible vinyl. Premium matte finish on top. Black magnetic backing. 3 sizes available: 3″ × 3″ (8 × 8 cm), 4″ × 4″ (10 × 10 cm), 6″ × 6″ (15 × 15 cm). Blank product sourced from the USA. This product is made on demand.
