Includes head shell, domes, and orings. Head shell is clear anodized for great looks and protection against corrosion. This head uses the stock orings in the top of the cylinder. Please note that the water routing is not the same as stock. The head shell is one piece, but it does not allow water to pass from one cylinder to the other. Water is routed in to the head pipe of the exhaust and exits out the head to the water bypass.