THEY ARE PRODUCED BY A DIFFERENT SUPPLIER THAN THE "NON ECO" SERIES. 12 MONTH WARRANTY!Compatible Printers:Ricoh Aficio Sp 3500SF,3510SF,3500DN,3510DNSP 3500N / SP 3510DN / SP 3500SF / SP 3510S. BLACK ECO SERIES COMPATIBLE SP3510 TONER FOR RICOH AFICIO Sp 3500SF,3510SF,3500DN,3510DN Type SP3510 6,400 PAGES.
eBay