The product is a postcard featuring the Soo Locks in Sault Ste. Marie, Michigan, specifically focusing on the Reserve Ship MacArthur Lock. This postcard captures a nautical and transportation theme, showcasing the United States region of Michigan. The material used is paper, and it is in photochrome era (1939-Now). The ship is the main subject of the postcard, providing a glimpse into the history and significance of the Soo Locks in maritime transportation.