【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").Note: Magnetic strength is lower than neodymium magnets - may not suit high-force applications 【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 【Explore the World of Magnets】- The gentle yet perceptible magnetic pull of ceramic magnets makes them ideal for interactive exploration. Place the magnets on any smooth surface and gradually bring them closer to feel the captivating force at work. A delightful way to spark curiosity and inspire creative experimentation among budding scientists and artists alike 【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 【Warning】- Not a toy. Strictly for users aged 14+. Children under 14 are prohibited from use (per Amazon safety policies), as improper use of magnets may pose a swallowing hazard