Magnetic Material Sheet 12 x 24-inch (.030 in. thick) Black Thin & Flexible for Magnetizing Bumper Sticker Flexible magnetic material. Very thin., .75 mm, about 1/2 as thick as a penny. 12 x 24 x .030 inch Black on both sides Clings to any steel surface Please purchase from Lifeweaver LLC to assure item is not an inferior counterfeit.