Ribbon Refill for Sharp Calculator EL2607P Use these ribbon refills to restore your Sharp Calculator EL2607P. The ribbon has a twin spool including both red and black. Replace your old spool and make your Sharp Calculator as good as new. Sharp PR42 Ink Roller Red and Black The Sharp PR42 Ink Roller is compatible for use with your Sharp printing calculator to keep it printing clear, easy to read calculations. It can print in red and black so you can have 2 colours on your calculations or receipts.