InkOwl Toner Refill Kit for LEXMARK CS310, CS410, CS510 (4-Pack, with Reset chip) Includes 4 bottles of Ink Owl premium formulation toner, 4 spouts for easy pouring, easy-seal tape, 4 reset chips, and easy, detailed, graphic instructions. LEXMARK CS-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 black toner powder for 4000 pages of black at 5% page coverage. Includes enough of each color for 3000 pages at 5%. These are the same yields as a set of LEXMARK high yield cartridges.