InkOwl Toner Refill Kit for Samsung MLT-D111S (4-Pack) Includes 4 bottles of Ink Owl premium formulation toner, a spout for easy pouring, easy-seal tape along with detailed, graphic instructions. To refill this cartridge model, you'll need to pierce a hole. To do so, it is highly recommended that you use a laser cartridge holemaking tool designed for this purpose. The use of any other tool, including a drill, is not recommended to avoid damaging sensitive internal components. You can then use the provided easy-seal tape to seal the hole. To get the tool: http://www.amazon.com/dp/B008J4P5JU Our instructions will guide you step-by-step through the entire refill process and include pictures showing you exactly where the hole needs to be pierced. With this cartridge, it is not mandatory to replace the chip since the low toner error can be bypassed. Since removing the chip is quite difficult, we recommend not replacing it. If you have a M2020/2021/2022 printer, you can simply keep printing with the toner low light still on. If you have a M2070/2071 printer, you can also continue to print using a bypass procedure (included in the instructions), but error messages will still pop-up. Each bottle contains 45g of toner powder for 1000 pages at 5% page coverage. This is the same yield as the original SAMSUNG cartridge.