The Porelon IBM Electric II Compatible Correctable Mylar Typewriter Ribbon replaces manufactures part #'s 1136310 and 1299095. This ribbon provides vivid and consistent black color in addition to exceptional light fastness and durable impressions. This product has been designed and manufactured to operate the original equipment identified. 1 pack. Porelon specializes in creating inking products and elastomers for a wide variety of industries. They focus their scientific, engineering and customer service efforts on delivering solutions that perform to your exact specifications.