This Printmark compatible CE255X Toner cartridge has been manufactured to high international standards to work in this range of HP printers. HP LaserJet P3015/P3015d/P3015dn/P3015x/Pro MFP M521dn/M521dw/ Enterprise 500 MFP M525dn/M525f (HP 55A/55X) / CART 324ii These consumables offer an economical alternative to the genuine product and come with a complete 100% satisfaction guarantee.