Made of 18/10 stainless-steel mesh, the basket is framed in heat-resistant plastic;Basket does not affect taste or aroma;Lid helps maintain warm temperature for a longer period and can be flipped over and used as a drip-off tray;Brewing Basket size L fits cups with diameters from 2.8 to 4-inches; dishwasher safe and also easy to clean under tap water;International patents: US Pat: 6 161 470, JAP 21 6889/1999, DGM 298 13 791.7