Hi John, thanks for your review regarding 19978Z-SS-DST!
The faucet body, spout, and handle are metal. Unfortunately, we do not have a complete breakdown of the materials used; however, metal parts are usually brass (hub, handle, body, tube, fittings), zinc (escutcheon, hub, handle), or stainless steel (set screw, undercover plate). Quality is of high importance to us, and our products undergo rigorous testing to ensure high-quality performance. Non-metallic products are beneficial in that they do not rust or corrode and help prevent heat transfer. Please feel free to contact us with any questions or for further assistance.
Best Regards,
Emma
Digital Communications Specialist