Tryeh glass tumbler features a built in stainless steel strainer. 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 approximately 14-16oz of tea.