Silicon carbide sanding discs are a great choice for sanding glass and stones. These are a higher quality and longer lasting disc than other brands on the market. Mix and match grits and sizes to receive bulk discounts at checkout.
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Discs seem to be fine and as advertised. The only problem I had was that I could not tell what grit was on about half of them. Not all of them were properly marked on the back. I guess they were cut from larger pieces. Wasn't too much of a pain because you can, of course, feel/see the front sides, but it would have been easier if they were marked. So far I have only used the course grit and the disc held up and cut well.