Pallet Pak units are designed for light-duty transport (non-D.O.T. regulated) for indoor or outdoor applications. The base of the pallet frame is designed for a forklift. The rectangular pallet paks have a metal frame and the cylindrical have a plastic base.The 300-gallon pak can be stacked two high. The tanks are manufactured from medium density polyethylene with U.V. inhibitors and are designed for contaiment of liquids of up to 1.7 specific gravity. Tank walls are translucent for level viewing and equipped with gallon indicators. A: 110 Gal Pallet & Tank B: 210 Gal Pallet & Tank C: 150 Gal Pallet Pak - 2 Tanks, Pallet & Frames (300gal. total) D: 300 Gal Pallet Pak - 1 Tank, Pallet & Frames