Hiware 13.5-Ounce Double-Wall Insulated Glass Mug, Glass Coffee/Beer Mugs, Set of 2, Clear Set of 2 double-wall glass mugs with 13-1/2-ounce capacities Conveniently designed, this awesome set of Double Wall Mug is the ideal tool for coffee, tea and other hot or cold beverages Top quality borosilicate-glass construction; durable and heat resistant Safe for dishwasher and microwave use; not for use with metal utensils LIFETIME WARRANTY: Hiware is completely confident that you will love its "Double Wall Mug Glasses" if you don't like it, we will refund your money back no questions asked! You have nothing to lose and a lot to gain by purchasing this product!