COPPER GASKETS UNLIMITED IS A CUSTOM GASKET MANUFACTURE FOR HIGH PERFORMANCE ENGINES AS WELL AS STOCK APPLICATIONS. ALL COPPER GASKETS ARE CNC MILLED FROM  COPPER SHEET.COPPER GASKETS CAN BE REUSED IF NOT DAMAGED. PLEASE BE SURE MY GASKETS WILL WORK FOR YOUR APPLICATION NOT ALL GASKETS LISTED ARE STOCK BORE OR STOCK THICKNESS. MADE IN USA