Alright, need a little help here. Everyone talks about GEM "PTFE" coated blades being the ones to use for GEM style razors. Personna and Ted Pella seem to be the two brands that come up over and over again. What does the packaging look like for these recommended blades? The only thing I can find that shows the packaging is the below Amazon link, but the package says uncoated. What am I supposed to be looking for and what is the best place to order them in the US?