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 a larger sculptural projects.  Ceramic mold can be used many times. Coat with casting primer before using. Mold makes 2 river rocks. Mold measures 5" x 7". Castings measure 2" x 3" (110 gram fill weight) and 2-1/2 x 3-1/2" (150 gram fill weight).  Rocks created by artist Mark Hufford using his "River Rock" technique. Images courtesy of Creative Paradise, Inc.