Very very reliable. My only problem is trying to make a quarter coin ring out of it. The 25mm "dome" (hollow) was great for tapering my rings. BUT - once I "reached" the 25mm dome, the next smaller size - around 20mm - was too small for my coin. I realize this is a very specific question, but thought anyone thinking about buying this coin ring might find this a helpful observation. I'm not even sure if there are other blocks with cavities between 20-25mm - maybe not. Also, it seems to be very durable. Needed a little cleaning but it's not critical.
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