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You should be able to see if they're used by looking for the streaks that would be made by the rotating disk, and by the thickness. Heck, I bought a used Ninja 250 caliper and made an adapter so I could put it on my 1972 H2. It had EBC HH sindered pads that were about 1/4 worn out, but they still work very well, so I'm going to go ahead and use them.
EBC HH sintered pads are good in my experience.
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