475 ml capacity. For perfectly steeping your tea. *Put a scoop of loose tea into steeper; *add hot/boiling water. Close lid and wait desired time for steeping. *Place steeper on top of mug to raise the pressure plate to open the valve, which automatically releases perfectly clear tea. *Lift and the valve closes, stopping the flow of tea. *Enjoy your tea! Easy to achieve a perfect cup of tea, as the leaves have enough room to properly open and uncurl while infusing. Made from durable BPA-free plastic. Dishwasher safe. Includes a tea scoop.