Personna Single Edge Blades...

I genuinely don't have a clue, but they look more like the blades used in injectors like the Schick (similar to these) rather than the Cobra or Feather Artists.
 
They are injector blades, used in Schick, Pal and other injector razors. They are not suitable for Feather/Cobra razors....

For Feather Artist/Cobra I think you are limited to Feather/Dorco/Kai blades....

I have a couple of injectors, I have only ever used the injector blades from Connaught.....
 
Personna do actually do a long blade, but they're spined and for use in hair shapers of fringe shavers like Wecks: http://www.ebay.co.uk/itm/Personna-60-Hair-Shaper-Blades-12-Packs-of-5-Glide-Coated-Single-Edge-Razors-/141141680977

I guess you could remove the spine.
 
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