When sourcing fridge magnets, the magnetic pull force is the most critical technical spec. For standard decorative magnets, flexible isotropic or anisotropic rubber magnets are common, but for heavy-duty or premium souvenir types, Neodymium (NdFeB) magnets offer superior strength. Ensure the thickness of the magnetic layer is at least 0.5mm to 1.0mm to prevent sliding. For the surface, verify that UV-resistant coatings or high-quality PVC/Acrylic are used to prevent color fading and peeling over time.