Ace Rayon Taffeta Seam Binding

Found this vintage roll of Ace seam binding. It's rayon taffeta in a dark color, looks like black or maybe a very dark navy. The packaging says it's 9 feet long and 1/2 inch wide with those fast woven edges. Cool little find for anyone into vintage sewing supplies or just needs some old school binding for a project. Packaging has that classic mid-century look to it.