Gold anodized. Forged billet aluminum construction. The clear polycarbonate window allows you to see straight into the throttle body of the running engine. Includes a pre-oiled black cotton air filter element which is washable for best filtration and the least restriction in air flow. The backing plate features a radiused air inlet and the Ness hidden breather backing plate technology for the cleanest look possible. Kits are complete and include all gaskets and hardware required for installation. Note: An optional rain sock / pre-filter is available as 590442. 18-23 Softail 17-23 Touring (excl. 2023 FLHXSE FLTRXSE) 17-23 Trike