Our famous flat bottom design results in rich flavor extraction. We have taller fluted walls designed to protect against the overflow of grounds into your coffee during the brew cycle. High quality, heavy weight paper slows water flow, allowing for better immersion of the grounds in hot water. Universal in size, fits most home coffee makers flat bottom coffee funnels. Flat bottom design allows for an even leveling of the coffee grounds and ensures a balanced interaction between hot water and the coffee grounds, for superior flavor extraction.