These Magnetic bumper stickers are printed on high-quality magnetic sheeting with the strongest polarity to withstand extreme weather conditions. Our magnets are made of flexible vinyl making them stick to almost all smooth metal surfaces including cars, fridges, lockers, signs, and many more applications. Magnets are a great alternative to traditional vinyl stickers as they are reuseable and easy to move without leaving residue. Magnets are printed on .30 mil vinyl unlike our competitors that use cheap thin magnets that fall off easily. As always we offer 1000% satisfaction guarantee on our products.