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Your cart is empty.Stone Master Mold's rubber stone mold in River Rock is ideal for making your own veneer stone for any indoor/outdoor project where stone cladding is needed. River Rock is a naturally river-worn, full-size stone, varying in sizes up to 10” in diameter, with thickness varying from 1-2.5" in the center. Each mold makes approximately 1.75 square feet. River Rock is most often used on log cabins and coastal homes, on the outside and inside. It is gorgeous on fireplaces, too. Stone Master's rubber molds are made from plastisol, which requires no release agent and will last for hundreds of pours. Each mold measures approximately 23.75" long by 11.5" wide, by 2.25" thick. This mold includes recycled plastisol. Made in the USA, both materials and labor. Available in 5 unique versions, with no stone repeats. Matching River Rock corner molds are also available.