3M Adhesive Backed Neodymium Magnet 1.Dimensions: Customized / Produce according to your needs 2.Materials: NdFeB,Grade N35 to N52 (M,H,SH,UH,EH AH) 3.Plating/Coating: Nickel,Zinc,Epoxy and etc. 4.Magnetization direction: Axial magnetized 5.Max operating temp.: 80 degrees celsius These discs magnets come with pre-applied,3M or Chinese adehsive on one side.They are often used for magnetic dosures on folders,book cover,boxes,presentation materials.Also good for hanging a poster or hanging art on a wall.