2PK New Genuine Smith Corona H Series 21000 Correctable Typewriter Ribbon Genuine Smith Corona 21000 Correctable Film Black Ribbon (2-per pack) Two Correctable Film Black Ribbons per package. Also known as H21000. Correctable Film Black Ribbon = has the "ability to be" Corrected with Correction Lift-Off Correcting Cassettes or Lift-Off Correcting Tape spools If you need the Correction Lift-Off Correcting Cassettes or Lift-Off Correcting Tape spools (SEE SMC21060, SMC21050 or Nu-Kote 269LC, 268TL)