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These molds have great detail. Just make sure so give your plaster, or hydrocal, plenty of time to harden.I use plaster, and usually give it 3 hours.

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All there rubber molds have the part# stamped in them. Just make sure to clean out each molds good after each use, and you will achieve good results every time.

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They have enough variety in their different molds to make any rock outcropping you need. Have fun!