Built with 1/4" thick steel plate. They have an all welded construction. They have an excellent heat retention capacity. They have a big firebox baffle and the smoke stack is placed in the center of the grill section this helps to reduce the cold and hot spots in the grill section. They come with framed slide out grills, stainless steel spring handles, folding table, adjustable air intake and adjustable smoke stack. The fire box has a fire grate designed to promote air flow and sliding cooking grate.