The AeroPress is a device for brewing coffee. It was invented in 2005 by Aerobie president Alan Adler. Coffee is steeped for between 10-50 seconds (depending on grind and preferred strength) and then forced through a filter by pressing the plunger through the tube. The filters used are either the AeroPress paper filters or disc shaped thin metal filters. The maker describes the result as an espresso strength concentration of coffee, but its most frequent use is more in the filter brew strength. The device consists of two copolyester cylinders. One cylinder has a rubber plunger and fits inside the larger cylinder to create an airtight seal, similar to a syringe.