Intended for use with the multi-wonderful Klima Air Launcher. Stainless steel, 6mm or just shy of 1/4 inch in old money. That's a bit bigger than the Estes MaxiRod. It comes in two pieces that are threaded together for easier portability. It is also way way way less likely to get bent than one long Estes Maxi Rod (that connects its two pieces permanently with a hammer-in roll pin).
Cheaper/better than the Estes one!
Our Rod is singing that old (1963) Wayne Newton chart topper "Danke Schoën" that was also featured in that 1986 cult classic "Ferris Bueller's Day Off" a more interesting reference for the younger rocketeers among us :-) and more in keeping with this rod's suppliers