Double wall design with stainless steel interior and high heat enamel exterior. Bowl creates a natural gas shield to yield a smokeless fire. Bottom vent design pulls oxygen in feeding the flames below. Stainless steel interior and base are rust resistant. Extreme clean burning heat finishes with nothing but ash. Best used on brick concrete stone or other masonry surfaces. Patent pending Ash Tray base is easy to clean. Works with standard wooden logs or wood chunks less than 16". Dimensions: 19.5"L x 14.65"W x 19.5"H.