Just fill mold with frit to create beautiful custom door or drawer knobs. Manufacturers recommend using Boron Nitride with these molds to prevent sticking. I have Slide High Temp Mold Release in my ebay store and it contains boron nitride. Two Large Oval Knob Mold Just fill mold with frit to create beautiful custom door or drawer knobs. Two oval door/drawer knobs per mold. Large Oval Knobs 2.25" x 1.25".