The 8 cup La Cafetiere Tirra patented plunge system removes all coffee grounds. If you want great tasting coffee right through to the final cup then use the Tirra system. Simply pull the plunger up and out into the lid removing the grounds from the liquid to stop the brewing process. The Cafetiere has heat resistant glass beaker. It has a base diameter of 11cm/4.3in and an overall height of 23cm/9.1in.