The Epson Perfection Wet Mounting tray is a removal scanning tray that allows fluid mounting seperatly of the scanner. This is the same tray that was included with the Epson Perfection V750 scanner. The V700, V800 and V850 scanners do not include the wetmount tray. You may option to purchase one with the Aztek Starter kit for the Epson Perfection V700, V800 and V850 or seperatly as listed here. This mounting tray provides an aperture scan area of 9.75" X 7.25".