Combine high performance and convenience with these 15mm x 15mm x 1mm self-adhesive, super strong block shaped neodymium magnets which have an endless list of uses. Many people use them for book and folder closures, creating fridge magnets, packaging, craft making and retail displays. The magnets are coated in several layers of Nickel, Copper and Boron to enhance the lifespan of the magnet and the coating also provides a clean finish. The high-performance adhesive relies on pressure-sensitive 3M adhesive that strengthens and cures with time. It is recommended to allow between 24 – 32 hours for the adhesive to fully cure.