This item is a must have if you are running a smoke system. The tray is CNC cut from .125” (3mm) thick Birch plywood that assembles in minutes. Mounting dual tanks has always been tough because most aircraft have lightning holes right where you need to place the velcro straps. With this tray you mount it to the aircraft tank floor with wood screws. Then you can easily mount the tanks with just one velcro strap on the back of the tanks.