The tea tray is composed of natural black stone plate and metal (made of aluminum) water storage chassis, The disc is integrated designed by the plane and the concave surface, with the thickness is only 1.6cm. the plane is the "dry" area and the concave is the "wet" area, which skillfully realizes the dry and wet separation, Moreover, the horizontal position of the concave surface is just 3/4 of the height of the metal water tray. When the tea volume reaches the corresponding position, the tea can be visually seen spilling from the drainage hole, reminding the user to dump the tea.