Low beam consists of three high-power advanced optical D lenses and a DRL. High Beam keeps low beam illuminated and adds two additional advanced optical D lenses with three projector lenses for an incredibly wide optical pattern producing an ideal beam pattern with illumination down the road as well as on either side. Made from a heavy-duty, light-weight die-cast aluminum, the low-profile housing requires no trim ring and offers a plug and play installation with H4 connector. Durable polycarbonate lens for long term durability. Headlamps are SAE, DOT and ECE compliant. Made in the U.S.A..