For single-flue. 100% 304 stainless steel. 24-gauge single piece stainless steel hood with roll formed edges. 16-gauge stainless steel base for extra strength. 18-gauge 3/4" expanded stainless steel mesh. Expanded metal mesh turned inward at base to allow cap to rest firmly on tile closing. Outside mounting provides greater free air-space for better draft. Use optional leg kit (model No. LK4-SS) when the flue tile does not extend above crown. Lifetime warranty.