【Size of magnet】: Each set comes with 30pcs magnets and a box for your convenient storage. The dimension is 15mm x 4mm. With this size, the magnet is more durable and not easy to break. 【Magnet Coated】:Ni+Cu+Ni triple layer coated,which Provides a Shiny and Rust Resistant Protection for the Magnets.High Quality Fridge Magnets Built with Rare earth magnets to be Strong and Durable and Long Lasting. 【Powerful Magnet】：It can hold up multiple pictures, many sheets of paper or artwork，and easy to use, Strong permanent Neodymium Magnets Grade N48 Magnets 【Widely used】: These magnets are perfect at work for sticking receipts, tasks, papers or instructions against a magnetic board or at home for hanging art work or family photos against the fridge. Ideal for model building, for crafting, experimentation and fixtures of all kinds. 【Satisfaction Customer】- If the items you received is defective, please inform us within 7 days upon receipt of item, we will replace another new one.