5" x 300" Galvanized Steel flexhose.  

18 Gauge Steel.  

This flex hose can be stiff but allows for torsional movement (twist). You can extend and contract this flex easily. This allows for proper installation at its "relaxed" length, allowing for movement in both directions or "float". This also has the finest square-cut ends in the industry and deburred (handle without getting cut).

Sold as a 300" roll.