40X9669 Lexmark 300K, Maintenance Kit Lexmark 300K, Maintenance KitThe 300K Maintenance Kit contains the Imaging unit maintenance kit, pick rollers and separator rollers. It is recommended that the kit be installed at 300,000 pages.The Imaging unit maintenance kit contains a toner filter, ozone filter and a transfer roller. Lexmark Laser XM9145 Monochrome Laser MS911de Multifunction XM9165, XM9155, XM9145, MX912dxe, MX912de, MX911dte, MX911de, MX910dxe, MX910de