This kind of racking is unlike a lot of the kinds of racking you have already learned about. This system uses a first-in, first-out order, where the first object put into the racking is also the first one to come out of the rack. This is because the system uses a loading area and an unloading area. When you put a pallet into the loading area, gravity and a series of rollers and bearings will move it to the unloading area. This creates a flow of pallets that are always ready for unloading.