This is a major part of the cartridge it looks like a cylinder in the lower part of the cartridge. Normally after 3 cycles you should replace your old drum to extend the life of your cartridge.
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This drum is to be used in the following compatible toner cartridges: LexMark Optra S 1250, 1620, 1650, 1855, 2420, 2455 (and other equipments using the same toner cartridge, which use the same basic internal mechanism also known as "engine" )