This percolator is made from borosilicate glass; the inner central cone is frosted and has 4 holes. These should be about 1 centimeter below the water level to allow for optimal percolation of the vapor. The vapor will travel up the central shaft inside the frosted inner cone before filtering through the water as it passes through the 4 percolation holes. The vapor will then coalesce as it travels up inside the outer cone delivering smooth, dreamy hits
