Made of stainless steel. The hearts are 3/4" tall and 3/4" across. 1/8" diameter handle, 11" long overall. The heart shaped portion is 1" long, allowing you to make your heart that deep. Or, you can make two hearts on one mandrel. Please note, as these are made by hand, there is some natural variation in exact shape and dimension from tool to tool. Skill Level: You should be able to make beads with the proper pucker easily, be able to lay down a straight line of glass, and manage glass temperature to prevent thermal cracks.