0.40mm magnetic sheets are uncoated. Those are also known as plain magnetic sheets. It’s for lamination. 0.40mm magnetic sheet has a plain, black face and a black magnetic backing. 0.40mm magnetic sheet’s one face is magnetic and other side is for lamination. The magnetic sheeting has a UV (ultra-violet) hardened coating on the magnetic side. UV coated magnetic side is glossy. 0.40mm magnetic sheets are fit for fridge magnet production. The magnetic force is enough to carry cardboard, paper and etc. Each box has 50pcs magnetic sheets.