Six-piece unpainted bridge cast from a high density gypsum stone. Kit includes an extra part with each stone arch kit to expand the bridge to a double arch with the purchase of an additional (#9001) kit! 40 scale foot single-track bridge. Measures 1-1/2′ high x 3′ long (3.81cm x 7.62cm). WARNING: This product can expose you to chemicals including Silica Crystalline (quartz), which is known to the State of California to cause cancer.