Thin & Flexible Magnetic Material Sheet 16-inch x 12-inch Black for Magnetizing Bumper Sticker or Crafts Flexible magnetic material is black on both sides. 12 x 16 x .020 inch Clings to any smooth steel surface Very thin. About 1/3 as thick as a penny. Please purchase from Lifeweaver LLC to assure item is not an inferior counterfeit.