Well, I noticed that replacement kits include a handle, so I'm assuming the handles of the galvanized sweeps are most likely galvanized steel because if they were something else like stainless or aluminum, why provide a replacement with the sweeps because the original would still likely be good.
I've pulled some stainless steel sweeps, that came out of the right sort of grill to be stainless, but were magnetic. I know that the degree of magnetism depends on the type of stainless. What I did notice is that regardless if the sweeps were attracted to a magnet, NONE of the handles were. I pulled what I assumed was a pretty clean galvanized set of sweeps out of some sort of master-touch grill & noticed the handle of that one also was not attracted to a magnet. So I threw the magnet on the sweeps & the magnet stuck. So, I've started looking at these sweeps a bit closer and suspect they are just dirty & stained "stainless".
I also seem to recall that there was a whole variety of other kettles that came with SS sweeps, so now I'm wondering if the handles might be and easier way to tell, at least when the sweeps seem to be in pretty exceptional shape.
So, I wondered if anyone who has what they know is a regular set of H-style sweeps where they could check the handle with a magnet.