ASR is Personna, but the Treet blades are different than the Gems from Walgreens. The Treet blades are uncoated carbon steel, and are my favorite SE blade. They will rust rather quickly of they aren't dried thoroughly right after each use. I also store them in a plastic airtight container.
Tom is so right!!! Smoothest shave I have ever had is with the Treet blade in a 1912! The Gem blade lasts longer, but isn't anywhere as smooth.