No brass, no aluminum.
These are soft enough that grit can embed into the rod and scratch the bore and the delicate muzzle.
This is counterintuitive. It would seem that a soft rod would do less damage, but a grit embedded rod becomes a lapping rod that can ruin a barrel.
You'll never see a Match shooter or benchrest shooter using aluminum or brass rods, or screw-together rods.
Most Match shooters use either one-piece stainless steel or carbon fiber.
Coated rods coatings never stay on all that well.
Many Match shooters are going to carbon fiber for one reason: Either the rod is perfectly straight, or it's broken.
The top brands are Dewey and Tipton.