Show Your Support Fill mold with glass frit and scrap glass to create one-of-a-kind cast glass jewelry. Create four castings at once! Ideal shape for a stand-alone piece or use as accents in larger fused pieces. Try combining opal and transparent glass to give dimension or add sparkle with dichroic. Kiln wash before use. Coat molds with ZYP or casting mold primer before use. Mold measures 6-1/2" x 5-1/2". Finished large ribbon castings measure 2-1/2" x 3-1/2". Finished small ribbon castings measure 1-1/4" x 2". See size perspective of mold with quarter images shown.