This 2 Piece Kit Includes Jewelry Casting Flask & Rubber Sprue Base Kiln Tool Jewelry Casting Flask 2" X 2 1/2" Machine Oven Kiln Tool This is a new casting flask Made of high quality stainless steel alloy with to exact specifications for size, roundness and tolerances Rolled steel construction is stress relieved to minimize warping It measures approximately 2" x 2 1/2" (51 x 63.5 mm) New Sprue Base This is a new rubber sprue base This is used to hold casting flasks for wax casting It measures approximately 2" (51 mm) in diameter Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.