InkOwl Toner Refill Kit for BROTHER TN-420, TN-450 (1-Pack) Includes 1 bottle of Ink Owl premium formulation toner, a spout for easy pouring, easy-seal tape, and detailed, graphic instructions. BROTHER cartridges are easy to refill thanks to a toner plug on the side of the cartridge. Easy-seal tape is included in case the plug does not offer a good enough seal after being removed and put back in. Our instructions will guide you step-by-step through the entire refill process. Includes 85g of toner powder for 2600 pages at 5% page coverage. This is the same yield as the original BROTHER TN-450 high-yield cartridge. If the cartridge you're going to refill is the original cartridge (the starter cartridge) that shipped with your printer, you will also need to purchase a flag gear kit.