Permanent Filter with Stainless-Steel Mesh Brewing basket with stainless-steel mesh and heat-tolerant plastic frame. Ample room for the tea leaves to expand. Permanent filter for brewing either tea, herbal tea, fruit infusions or coffee. Aroma unaffected! Taste unaffected! Longlasting! The lid doubles as a handy drip-off tray for the brewing basket. Dishwasher proof.