Kyocera TASKalfa 4551ci YELLOW Toner Cartridge (Compatible) - Compatible Brand Estimated Yield 20,000 pages @ 5% Mfr Part #: Kyocera TK-8507Y, TK8507Y, 1T02LCCUS0 Copystar TK-8509Y, 1T02LCACS0, TK8509Y Also fits these models: Kyocera TASKalfa 4550ci Kyocera TASKalfa 5550ci Kyocera TASKalfa 5551ci Copystar CS4550ci Copystar CS4551ci Copystar CS5550ci Copystar CS5551ci