Hewlett Packard LaserJet Enterprise 600 M602n, dn, n, x; M603dn, n, xh; M4555, f, skm, h MFP - High Yield. Premium remanufactured MICR cartridge that meets all US and Canadian specifications for signal strength. By using a special high adhesion toner formula, designed specifically for your printer, this product can significantly reduce the possibility of costly fees stemming from rejected checks.