Create dazzling, detailed cast glass rocks. Simply fill the mold with glass frit, scrap and powders to make one-of-a-kind glass castings. These pieces are beautiful enough to stand alone or to incorporate into larger projects. Ceramic mold can be used many times. Coat with casting primer before using. Mold makes 11 river rocks. Mold measures 6" x 6-1/4". Castings measure 3/4" to 1-1/4". Fill weight 60 grams. Rocks created by artist Mark Hufford using his "River Rock" technique. Images courtesy of Creative Paradise, Inc.