Wave Series: The 155 Wave Dripper is a zipper type that is convenient for storing and storing [Wave Series] The original Kalita product series allows everyone to enjoy the best taste with ease from beginners to professional baristas and the 20 Wave] Wave Filter 185 (155) is less contact with the dripper so it will drip in the filter for a long time. But the wave zone is at the bottom. Because it is flat, it is easy to blend evenly with powder, for 1 to 2 people (estimate) [Caution] Please make sure to fold the zipper closure on the side and bottom. Otherwise, it may peel off during extraction. In addition, if you pick up the filter paper after extraction, the bottom may come out.