5 Gasser Fuel Tanks of various sizes. Scaled Properly to 2.5 Gallon (8"x12") 5 Gallon (10"x17") 7 Gallon (8"x33") 10 Gallon (12"x20") and 12.5 Gallon (12"x26") They are hollow and have drain holes in the bottom that can be filled relatively easily. Sold as a pack of five of one each.