Yes, they are stainless from Cone Engineering. I bought them several years ago for my tracker project but never used them. I had a track mount welded on, which is why I drilled and tapped the flat stock with 2 mounting holes. I want to be sure they are very secure. Cone Engineering makes larger units. I actually almost bought a pair of their “18 Quieter core units instead of the xs2 replicas. They are a little spendy but look really nice. They offer several different styles. Dime City Cycles sells them too, but I ordered directly from Cone Engineering.