PERSONAL BREWING MUG. The Radiance Steeping Mug is available in four colors and is designed for your comfort and tea-drinking pleasure with crystal clear thermal glass that’s durable as well as beautiful. Holds up to 12 ounces of pure, delicious tea. SUPERIOR QUALITY GLASS. Highly hygienic, non-porous borosilicate glass does not retain odors or stains. Lightweight and more resistant to thermal shock than any other glass. INSULATED DESIGN. Double-walled borosilicate glass with porcelain lid maintains ideal temperatures – both hot and cold. The double-wall glass base is furniture-friendly. EXCELLENT FLOW INFUSER. The extra-fine, food-grade 18/8 stainless steel filter basket provides excellent water flow and plenty of room for tea leaves to expand and brew. MULTI-FUNCTIONAL LID. Use the elegant porcelain lid to keep your tea hot while steeping, then rest the strainer basket on the lid to catch drips.