Doing a head gasket job on a Hyundai or Kia with the 2.4L 'Theta II' engine? This GXARTS kit has EVERY gasket and seal you'll need, saving you from buying pieces separately. It's a complete set for models like the 2011-2015 Kia Optima, 2012-2015 Sorento, 2013-2016 Santa Fe Sport, and 2011-2014 Hyundai Sonata (always verify your exact model!). The critical head gasket is a Multi-Layered Steel (MLS) type for a superior, durable seal. The kit includes the valve cover gasket, intake and exhaust manifold gaskets, valve stem seals, camshaft seals, various O-rings, and even a tube of RTV silicone. Using a complete, high-quality kit like this is crucial for a successful, leak-free repair that will last. Takes the guesswork out of parts sourcing.