THEY ARE PRODUCED BY A DIFFERENT SUPPLIER THAN THE 'NON ECO' SERIES. 12 MONTH WARRANTY! Compatible Printers P 4015 N, P 4015 TN, P 4015 X, P 4515 N, P 4515 TN, P 4515 X, P 4515 XM LASERJET ENTERPRISE M602N, M602DN, M602X, M603DN, M603N, M603XH, M4555 MFP, M4555F MFP, M4555FSKM MFP, M4555FSKM MFP, M4555H MFP.
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