Our magnetic rolls are specially manufactured using strontium, a non-toxic material with stronger holding power than regular barium magnets. The PVC lamination is perfect for making car signs using vinyl stickers or screen printing. One of the nicest features is the layer of glossy coating on the back of the magnet so it protects the car finish from scratches. We provide 3 different PVC laminations-matte white, glossy white and semi-glossy black. Unlike other brand name magnets, our magnet thickness does not include the thickness of PVC lamination. That means you will get heavier magnets by purchasing from us, and the heavier the magnets the stronger they are. These products are very good for making car signs, referigator magnets or use as vent covers.