Built-in finish, perfect for making 1 ~ 4 cups of coffee. 304 stainless steel inner filter woven mesh, 800 holes per square inch, hole size is 15 m (micrometers). So it is not necessary to place a paper filter during use. 1. Simply place the pour-over coffee filter on top of your coffee cup. 2. Use one and a quarter cups of water to one tablespoon of coffee per cup, as the grounds absorb some water. 3. Pour enough water on the coffee grinds to cover them and let them bloom for 30 seconds. It really improves the flavour and the coffee. Then slowly pour on more water but never to the point where the coffee grinds start to float. Materials: 304 stainless steel & silicone Dimension: 18.4 * 8.