6w-1000b Insulated Double Wall Straight Pipe 1000mm, Black. Also includes cable ties. I finished the chimney work for my wood stove two years ago, and I purchased this extension chimney section just in case, but I'm selling it because it's no longer needed. I opened it once and installed it, but I removed it immediately without lighting the wood stove, so I'm selling it as new. Thank you for your understanding when purchasing.