【High Quality】- Premium quality 20 PCs ceramic industrial magnets with 20 PCs double-sided adhesive. Diameter is 18mm(0.71"), thickness is 3mm(0.12") | 【Strength & Durability】- The ferrite craft magnets has high demagnetization resistance, corrosion resistance and oxidation resistance, so it is the most widely used permanent magnet material at present. The power exists forever under 300°Temperature | 【Be Friendly to Children】- The magnetism of ceramic magnets is not as strong as that of rare earth magnets, which is safe for children. Place the magnets on the smooth surface. Then move them closer toward each other that you can perceive magnetic force. Children will have fun with friends or family and enhance creativity | 【Create Exciting Craft Magnets】- It is easy to install and use small circle crafts magnets stick great on any metal surfaces or non-metallic surface (sticker included ) These flat disc magnets have industrial strength and are most widely use our self adhesive ceramic magnets as Craft magnets, Sticky magnets, Science project magnets, Refrigerator magnets, Office magnets, Kitchen magnets, Whiteboard magnets, Industrial magnets, Fridge magnets, DIY magnets and Hobby magnets | 【Professional Brand】-Made under ISO 9001 Quality Systems. We provides professional design and consultation service according to customers’ requirements. You can search TRYMAG to get the crafts magnets if you want to buy other size