Porelon 11463 IBM Wheelwriter 3, 5, 6 Correctable Mylar Typewriter Ribbon, 1-Pack Compatible correctable mylar typewriter ribbon, replaces manufacturers part #'s 1337761, and 1380999 Vivid and consistent black color Exceptional light fastness and durable impressions Designed to operate with original equipment identified, and will not void equipment warranty One year (12 months) warranty