BREWING BASKET M – with micro-fine stainless-steel mesh. The finum® permanent filters offer  ample room for tea leaves to unfold and to release their full flavor. Made of stainless-steel  micro-mesh in a heat-tolerant frame  from BpA-free PP material. These filters are durable and dishwasher-safe. The hat of the filter helps to prevent heat loss and doubles as drip-off tray.