【Adhesive Disc Magnets】- Due to the incredible strength of neodymium, we strongly recommend allowing 24 to 36 hours for the adhesive to cure. Adhesive may not work well with all materials.Be produced by rare earth material and are composed of neodymium (Nd), iron (Fe), and boron (B), with the highest grade N52, our neodymium magnet has the strongest strength compared with other similar size magnets. 【Anti-corrosion】- Coated with Nickel-Copper-Nickel 3 layers metal, our NdFeB magnet has no rust when you put it in the air for a long time. 【Multipul Use】- This convenient small adhesive magnets with 3M 4920VHB adhesive, they are widely used in your daily life or work: crafting, photos, greeting cards displaying, office paper sticking and so on 【Warning】- Be careful with magnets because strong ones can hurt your fingers. When pulling apart big magnets, be sure to do it the right way. If you do it wrong, the magnets can get too strong and easily break. Also, be far away from pacemaker and children in case of harm. 【Quality guarantee】- Welcome to contact us once you get wrong or bad magnets. We will be sure that all the information we provided for the products is correct. Neodymium Magnet with Very High Bond adhesive backing D0.5"x0.0625", 1/2 inch diameter x 1/16 thickness thin magnet with self adhesive double side