3M Acrylic Foam Tape 4229P is a 0.76mm thick, medium-density, dark grey acrylic foam double sided adhesive tape with high performance acrylic adhesives. Double Sided Acrylic foam adhesive tape is grey with red polyethylene release liner. General purpose double sided adhesive tape with superior adhesive bonding strength for a wide variety of surfaces. Can be used to stick neodymium magnets to non-ferrous material surfaces like plastic, copper, stainless steel, wood, glass, tiles, concrete as these materials does not work directly with magnets. The acrylic foam of 0.76mm thick allows the adhesive to mould to slightly rough surfaces like concrete.