I looked at the sweeps in my 26" GB. They do not appear to be made of aluminized steel, used in making the standard ash sweeps. The metal looks different than the standard ash sweeps but also different from my older black 26"er. The older SS ash sweeps have a shiny, almost polished look to them. My guess is the grade or type of stainless steel being used in the new GB's is different from the older ash sweeps.