This cast metal advertising paperweight features a pair of weary workhorses, colloquially known as plugs, standing on a rectangular plinth. The piece was produced as a promotional item for Prime's Plugs, likely referring to the Prime Spark Plug Company. The horses are stylized with drooping heads and prominent ribs, creating a visual play on the word plugs. The item is constructed from cast metal, possibly iron or spelter, and retains remnants of a weathered bronze-toned finish. The front vertical face of the base features raised, cast lettering that reads PRIME'S PLUGS. Faint, partially legible incised marks are present on the top surface of the base near the hooves, with characters resembling A B on the left and W A S H on the right.