The Toner Refill Chip for HP 4600 - Canon LBP-2510 / ImageCLASS C2500 allows you to refill your cartridge while maintaining the your printer's diagnostics to estimate the amount of toner remaining in the cartridge. The Toner Refill Chip for HP 4600 - Canon LBP-2510 / ImageCLASS C2500 tells your printer that the cartridge is new or filled. All of our chips are easy to replace. Instructions are included in your SoHoJet Toner Refill Kit.