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Available in 12" x 12" and 24" x 24" sizes. 1/4" thick. SilkeMat™ Is a NON-CARCINOGENIC refractory fiber blanket that can be cut, molded, rigidized and formed. It can be used with and without rigidizing. Although a high-grade boron nitride separator could be used for art glass firings, we have not found this necessary There is no “shot” in this product and most firings are clean, leaving only the texture of the fiber on the glass.