Designed with double wall construction and a durable stainless steel inner liner. Intended to be used in place of standard single wall stove pipe. Interlocking joints, secured with screws provided, allow for quick and easy system assembly. Air space between inner and outer pipe allows reduced clearance to combustibles. 6" clearance to combustibles for 6" pipe as compared to 18" for standard single wall pipe. Engineered for superior smoke venting and safety. Helps reduce creosote build-up. Installation requires no cutting. Stainless steel inner liner, matte black steel outer casing. 6" I.D. Net assembled length is 1-1/2" less than listed lengths. No. 266012: Length: 12", Inside Diameter: 6", Clearance To Combustibles: 6", Color: Black, Finish: Matte, Material: Stainless Steel Liner & Galv Jacket No. 266036: Length: 36", Inside Diameter: 6", Clearance To Combustibles: 6", Color: Black, Finish: Matte, Material: Stainless Steel Liner & Galv Jacket ---- 1. 海外直輸入品となりますので、新品であっても、パッケージに多少のダメージがある場合もございますが、商品本体には問題ございませんのでご安心ください。2. 日本国内でのメーカーによる製品保証等は適用されません。3. パッケージや、説明書等は、英語表記となります。