InkOwl Toner Refill Kit for LEXMARK C540, C543, C544, C546, X543, X544, X546, X548 (Cyan, 1-Pack, with reset chip) Includes 1 bottle of 60g Ink Owl premium formulation toner, 1 spout for easy pouring, easy-seal tape, 1 reset chip, and easy, detailed, graphic instructions. LEXMARK C540-series cartridges are super-easy to refill. There is a plug hidden underneath the label that is easy to remove. Our instructions will show you exactly how to access it. In case it is damaged during removal and no longer provides a good seal, this kit includes easy-seal aluminum tape so that the cartridge won't leak. For the proper functioning of the refilled cartridge, we have included a replacement reset chip. Includes enough toner powder for 2000 pages at 5% page coverage. This is the same yield as an original LEXMARK C540 high-yield cartridge.