These cabinets are manufactured from ABS plastic. ABS is extremely robust, and has remarkable ability to absorb shocks and bumps. We have tested one in extreme conditions, even bashing it with a digger bucket, and dropping from over 10 feet high shrugs it off! Another famous quality of ABS is its resistance to chemicals. Along with their effective weather and water seal, these cabinets can be used in all sorts of extreme conditions. Its not just about whats on the outside The internals of these cabinets are brilliant too. An innovative clamp and strap system firmly holds extinguishers in place, and accommodate pretty much any shape and size of extinguisher. Or they can even be taken out completely for a truly versatile space. And the best bit? They are remarkably cost-effective! Cabinet feet are also available, just reference product code CS0F (packs of 4)