All of the sockets at Steel Lighting Co. are handmade and tested in our facility. The E26 base is made of heavy-duty porcelain material and receives all common LED and regular bulb types. The black or white cord comes standard with 4 feet of length that you can extend by request for a longer cord, or you can cut the standard cord with a pair of scissors so that your light fixture hangs at the desired height from your ceiling. The colored covernut on the top of the socket is meant to match the exterior color of your particular light fixture. If you are threading the cord through a stem or a gooseneck, please order the wire lead option which comes with 6′ of wire leads.