The product is a CAT 9Y-1979 1.1mm thick exhaust manifold gasket designed specifically for Caterpillar equipment. As a genuine CAT part, it ensures high quality and compatibility with Caterpillar machines. This new old stock item provides a reliable solution for maintaining or repairing the exhaust system of heavy equipment, making it a valuable addition for those in need of replacement gaskets for their Caterpillar vehicles.