❤【SAFETY COMES FIRST】❤All the magnetic letters, numbers and ABC objects are made from BPA-FREE thick foam that ensures both safety and durability. Each letter with a full-cover magnet on the back. They can be attached to the refrigerator,dishwasher or our magnetic drawing board and won’t fall off. Our magnets letters is third party tested by an accredited laboratory per CPSC requirements. It conforms to ASTM F963 standards.