THEY ARE PRODUCED BY A DIFFERENT SUPPLIER THAN THE 'NON ECO' SERIES. 12 MONTH WARRANTY! Compatible coatings: OkiFAX 2510, OFFICE 2530, MULTIFUNCTION B2500 MFP, B2520 MFP, B2540 MFP. BLACK ECO SERIES COMPATIBLE TONER B2520 FOR Oki B2500 MFP B2520 MFP B2540 MFP 09004391 4,000 PAGES.
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