As-cast aluminum finish. Note o-ring with cup sealing system, included. Normal Brit-style jam nuts and statoseal washers also available in the store if you prefer that instead, extra cost. See listings below: https://www.ebay.com/itm/383213172443https://www.ebay.com/itm/382488898236 Beautiful parts. Italian-made of modern materials for modern fuel. On offer is one matched set, both with reserve, that can be mounted with spigot pointing front or rear depending on your application. No bottom ferrules are needed and modern fuel line no longer requires clamps. Installed, they look and work fantastic, with very smooth action and NO leaking. 1/4" BPT thread, which will fit very late BSA ('71-on), and nearly all Norton Commando and Triumph back to the early '50s. I will answer questions promptly, good luck and thanks for looking.