Inner Wall Rib Design -- The inner wall of this coffee pour over adopts a groove design for the distance between the filter paper and the filter cup,to fully extract the coffee essence. (filter paper is NOT included) Bottom Hole -- The single lager hole design at the bottom of the cone allows for consistent extraction, resulting in a well-balanced and flavorful cup of coffee every time you brew. High Quality Material -- Made of high-fired ceramic, with good heat preservation and durability, no odors and prevents heat loss during brewing. Matches a Wide Range of Coffee Containers -- 3.7in diameter at the bottom. it can be used as a coffee pot, mug, or other container to collect coffee. Application -- This coffee dripper is perfect for both beginners and coffee aficionados, widely used in many situations, such as home, workplace, camping, etc.