InkOwl Toner Refill Kit for BROTHER TN-720, TN-750, TN-780 (2-Pack) Includes 2 bottles 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 400g of toner powder for 16000 pages at 5% page coverage. This is the same yield as two original BROTHER TN-750 high-yield cartridges. VERY IMPORTANT: 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 the flag gear kit.