Please check the photo exactly to see if your rollerball pen is shown. Unfortunately there are model overlaps at Sharp and confusion. Ink roller black exactly like on photo for calculator models below, please study based on pictures if you ink roller is exactly yours... PLEASE CHECK PICTURE OF INK ROLLER FOR THE EXACT FITTING there are two different models in one sharp model in use..confusion but i put exact photo of ink roller on this offer. Sharp EL-1600B Sharp EL-1609 Sharp EL-1610 Sharp EL-1611 Sharp EL-1611A Sharp EL-1611C Sharp EL-1611E Sharp EL-1611H Sharp EL-1611H II Sharp EL-1611PGY Sharp EL-1611S Sharp EL-1619 Sharp EL-1621 Sharp EL-1801A