This small mold produces two focal pieces - an open heart and a circle - that were designed to be used with the Oval and Diamond Glasslinks chains. Fill the Heart with 7 grams of fine or powdered frit. Fill the Circle with 8 grams of frit. Fire these cool to only about 1335-1350˚F (725-730ºC). Hold for 25 to 30 minutes and then anneal.