What size filter does one use with one of these?
Featuring high quality construction the Hario V60 02 Black Glass Coffee Dripper is designed for manual, pour-over style coffee brewing and it is perfect for two cup brewing. Large curved ridges on the inside of the cone aid in the control of water flow as it interacts with coffee grounds. A durable Hario clear glass body helps prevent heat loss during the brewing cycle. The pour-over technique allows you to brew directly into your cup or server, (like the Hario V60 Range Server).