Nu-kote B40 IBM Selectric Model 71 Typewriter Ribbons Black 6 Pack 02-5713-231 Nu-kote B40 replacement typewriter ribbons designed for IBM Selectric Model 71 machines. This pack includes six high-quality black one-time film ribbons, providing crisp and professional results for your vintage typing needs. These ribbons are also compatible with IBM 3121 and Remington MC-100 models, serving as a reliable substitute for IBM ribbon number 1136108. Each spool measures 9/16" x 235', ensuring long-lasting performance for office or personal use. The ribbons are housed in their original packaging, which shows some light shelf wear but remains intact to protect the contents.