This is a makeshift salt/mineral feeder that is small, cheap, easy to pull around and simple to make.Great for sheep or small flocks of all kinds that require supplements. I used a $5 rubber door mat for the top flap, and an old rubber tub for the base. Inside the tub is a board that was cut to the contours of the container and screwed in place with washers. I then put the whole devise onto some short pieces of scrap as 'skids' and tied it to a short rope for dragging around the pasture to follow the herd.