Agree. Beautiful Astros pennant, Marc...
Really unique for one of that era. My Bench/Reds pennant arrived a few days back, but I would not call the felt super stiff. It's definitely modern material, but has some pliability and "give" to it.
I'm sure you've all seen this type of "felt'. I would say it's the same material as this one, which is much more common...
https://www.ebay.com/itm/40503089913...Bk9SR7CqkeKIZA
As opposed to this one, which more closely resembles the blade of a guillotine...
https://www.ebay.com/itm/29649655380...Bk9SR7CqkeKIZA