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. Then place steeper on top of mug to raise the pressure plate to open the valve, which automatically releases perfectly clear tea into your cup. 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. 475 ml capacity.