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US Navy Deep Sea Diver Derby Cover, 7 ¾ inches diameter Special Forces Airborne The Marine Gunnery Sergeant -The US Navy Deep Sea Diver Derby Cover, 7 inches diameter combines precision engraving with a premium finish for riders who want their motorcycle to reflect their style, service, or personal story. Product Details Billet Aluminum, Chrome Plated Derby Cover. Our process is to engrave the design onto a raw aluminum part. The engraved part is then sent to an professional chrome plater. Automotive grade PPG paint is used for a durable color finish. There