This genuine Lexmark 250 Sheet Tray Insert, part number 40X7645, is the perfect accessory for your compatible Lexmark printer. It is designed specifically for use with the Lexmark CX and CS series printers including the CS310dn, CS410dn, CS410dtn, CS410n, CS510de, and CS510dte. With a total paper capacity of 250 sheets, this tray insert is ideal for increasing your printer's paper handling capacity and reducing the need for frequent paper refills.This tray insert is made with the highest quality materials and is fully compatible with your printer. It is easy to install and will provide reliable paper handling performance for all your printing needs. With this genuine Lexmark tray insert, you can be confident that your printer will continue to operate at its best.