Drum unit black capacity 20 000 pages suitable for oki systems okifax 1000 oki systems okifax 1050 oki systems okifax 2200 oki systems okifax 2400 oki systems okifax 2600 oki systems okifax 5650 isdn oki systems okifax 5680 oki systems okipage 6e oki systems okipage 6ex oki systems ol400e oki systems ol400ex oki systems ol410ex oki systems ol600ex oki systems okifax 2350 oki systems okifax 2450 oki systems okifax 5200 oki systems okifax 5500 oki systems okifax 5200 plus