The Double Wall Glass Tea Tumbler features a built-in stainless steel tea basket. The double wall glass tea tumbler allows you to enjoy a warm cup of tea anywhere at any time. The clear Borosilicate glass shows the color of your tea while the double wall construction keeps the tea warm up to 3 hours. Tumblers are dishwasher safe and lids must be hand washed. Each tumbler holds approx. 14oz of tea.