We use only the best raw materials and expert craftsmanship to produce the best kilns available, and we’ve been doing it since 1982. Many of the Cone Art glass kiln models are available in both 9″ and 13.5″ depths. Every Tucker’s Cone Art Glass Kiln is certified and approved by CSA / CUL for Canada and the U.S.A., and CE for Europe. Compare a Cone Art to any other kiln on the market. Nobody can match us feature for feature.