12 piece,.375″d x.060″ thick, neodymium discs with foam adhesive, 6 north pole out, 6 south pole out, no glue is needed, just peel off the adhesive liner & stick, full cure 24 hours, industrial strength acrylic foam adhesive conforms to the irregularities of rigid substrates & adheres the magnet to a multitude of materials including wood, plastic, ceramic, rock, paper & much more, magnet to magnet use a north & south magnet for added strength & snap to positioning, magnets match up at same snap to spot every time.