The stones are poorly packaged (just some plastic wrap). When I rolled out my bricks, the 400/1000 brick has a rather large chip on the corner. It is roughly triangular in shape, 1 inch on one side to 3/8 inch on the other, and at least 1/2 inch thick. Stones also have burrs on the edges and need to be smoothed out immediately, although burrs can be easily removed.
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