5" X 10' Selkirk Aluminum Gas Relining Flexi-Liner Extension Kit. Flexi-Liner is the toughest Aluminum flexible chimney liner that you can buy. Flexi-Liner is built better for increased compressibility (which results in smaller cartons) and a rugged, rip-resistant product.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.