Made to function with most medium sized rolling trays, these Pulsar Magnetic Tray Lids measure 11 inches by 7 inches (27.94cm by 17.78cm) and feature a grizzly gorilla ready for war. These tray covers attach magnetically to the edges of the rolling tray to keep herbs, tools, and papers protected from gusts of wind, flying objects, and plain old everyday clumsiness!