AIM Compatible Replacement for Adler Royal 121D/21C Black Typewriter Ribbons (6/PK) (T6-77B) - Generic AIM Compatible Replacement @ Adler Royal 121D/21C Black Typewriter Ribbons (6/PK) (T6-77B) - Generic Our compatible toner, inkjet cartridges, ribbons, copier, fax and other supplies are constructed to original OEM specifications. Guaranteed Superior Quality to Meet or Exceed High Priced OEM Products Our Products are manufactured with new components and air-sealed in an ISO-9001, ISO-9002, ISO-14001 quality certified factory. Our Products are Engineered and Manufactured for use in 110V machines (unless specified in title) in North America. The use of our supplies does not void your machines warranty. Manufacturer Brand Names, Reference Part Numbers and Logos are registered trademarks of their respective owners. Any and all brand name designations or references are made solely for purposes of demonstrating compatibility. Pictures are used as Reference. Products are based on Description. All Products are sold in Retail Packaging. Retail Packaging is Subject to Change.