Nested Stove Pipe comes in (5) 21" pieces. When assembled the pipe stands at roughly 8'. Pipe starts at 4-7/8" to 5-7/8" round. (4-7/8" at stove collar and 5-7/8" top of the stack) 26 Guage Galvanized Steel. Has pre-drilled holes for flue damper installation. All sections slide inside of each other for compact storage after use. Fits the Spruce, Timberline, and Alpine models.