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Yeah, the low grits last a blade or 2 , but the others, not so much. I cut them into 2x3 rectangles to wrap around a cork. I would probably only buy the 800 and up.
I have been buying from several...

Online Industrial Supply
The price sounds almost too good to be true.
With 40 razors that need restored I think this would be in my best interest.

Wet or Dry Silicon Carbide Sandpaper Sheets