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I ran into yet another listing for these and it came with the following description--

Description
These Personna blades were designed for barber use and are stainless steel blades with the...

In just happened to run across your blades on razorbladesandmore.com -- These are Personna Blue "Lab" Blades and can be gotten in quantities if you wind up liking them -- Personna Double Edge Super...

+1 on the Israeli Crystals. Due to the generosity of a member here (thanks TonyN), I've had the chance to try them along with the Reds. The Reds give a smooth, great shave, and are a favorite of my...