All Church On Wheels Carts are made of high quality American steel and polyethylene. The corners are solid steel that is folded, stamped and coated in our facilities. The shelves are laser cut 14 gauge steel, and can hold up to anything. Some of our carts have a skin or outer shell, that skin is made of High Density Polyethylene and is scratch resistant. All carts use 6" casters that are rated at 1,200 pounds.. Each! To top off the list is our hardware, we use Heavy Duty aircraft quality nuts and bolts. Each cart has a specific list of features so check them out below.