Oil and Candle Holder P90453 approx. 4" diameter When porcelain is left unglazed the surface remains matte in texture. This form of porcelain is called bisque. Your bisque porcelain is exclusive to PartyLite and crafted with care. Porcelain is prized for its translucency. The characteristic thinness of bisque porcelain, enhanced with relief or sculpting, is a delicate and beautiful way to show off candle light.