Charcoal colored carbon fiber is one of the most popular materials used in manufacturing today because of its strength and attractive looks. Proform's new Carbon-style engine dress-up products are stamped steel parts with a carbon fiber film adhered to the exterior surface giving the parts that look customers crave at a reasonable price with the strength of steel. These CHEVROLET Bowtie valve covers are made of heavy-gauge steel, 20% thicker than typical aftermarket valve covers, greatly reducing the likelihood of leakage around the valve cover flange area caused by fasteners being over-torqued. All valve covers are sold in pairs, equipped with air breather and PCV grommets, unless specified otherwise. Compatible with Chevy Small-block engines 1958-1986.