Simax Glassware 2152/2 Dual Glass, Clear, Set of 2 Set of 2 double-wall cooler glasses holding 6.7 ounces each Mouth-blown, lab-quality borosilicate-glass construction; lightweight and thermal Guaranteed for use at temperatures between -40 C and + 300 C 10 year guarantee of all functional properties Made from recycled glass without cadmium and lead