InkOwl Toner Refill Kit for BROTHER TN-630, TN-660 (4-Pack) Includes 4 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. Replacement TN-630/TN-660 plugs are available on Amazon. Our instructions will guide you step-by-step through the entire refill process. Includes 350g of toner powder for 10400 pages at 5% page coverage. This is the same yield as four original BROTHER TN-660 high-yield cartridges. 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.