InkOwl Toner Refill Kit for SAMSUNG MLT-D103L, MLT-D103S (2-Pack, with reset chips) Includes 2 bottles of Ink Owl premium formulation toner, 2 reset chips, a spout for easy pouring, easy-seal tape along with detailed, graphic instructions. To refill this cartridge model, you'll need to pierce holes. 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 holes. To get the tool: http://www.amazon.com/dp/B008J4P5JU For the proper functioning of the refilled cartridge, we have included a replacement reset chip. Our instructions will guide you step-by-step through the entire refill process including replacing the chip. Note that the chip supplied in this particular kit is the North American version for USA/Canada. Each bottle contains 95g of toner powder for 2500 pages each (total 5000 pages) at 5% page coverage. This is the same yield as two original SAMSUNG high-yield cartridges.