For use in Ricoh Aficio SP C820DN, C820DNLC, C821DN, C821DNLC, C821DNX, Savin CLP340D, CLP350D, Lanier LP540C, LP540CT1, LP550C, LP550CT1, 4 PACK Compatible with RICOH part numbers: SP C820A, 821026, 821027, 821028, 821029, 821034, 821035, 821036, 821037 PREMIUM Toner kit contains 1 of each CMYK cartridge; MADE IN USA (not imported) PAGE YIELD: 20,000 pages/black and 15,000 pages/color, based on the ISO/IEC 19798 industry standard of 5% page coverage