Specifications: The hearts are about 3/4" wide at the bottom of the mold and 7/8" wide at the top of the mold. The molds themselves are 1.5" high and may be 1.75" or 2" square. Please note, while aluminum's melting point is below that of glass, it conducts heat away from the glass so quickly that it does not melt. This tool will become hot with use, so be careful if you move it after using it. Skill Level: To take advantage of these molds you should be experienced in pulling cane or stringer. You will need a heat proof surface to use these on. A graphite plate is recommended.