THEY ARE PRODUCED BY A DIFFERENT SUPPLIER THAN THE 'NON ECO' SERIES. 12 MONTH WARRANTY!Compatible Printers: HP LASERJET COLOR CP3525N, CP3525DN, CP3525X, CM 3530 FS, CM3530MFPCANON LBP 7750CDN. CE252A YELLOW ECO COMPATIBLE TONER SERIES FOR HP Laserjet Color CP 3525N, CP 3525 CE252A CE252 723Y 7,000 PAGES.
eBay