Alliance Brew Gear Kalita Style Filters work with any pour over or hourglass brewer that uses a narrow basket filter. Water follows the path of least resistance. Most coffee filters are made of randomly pressed fibers, creating weak spots. Water is drawn through those weaker areas first, leaving unsaturated grounds and varied extraction. Alliance Brew Gear premium pour over filters have universal material thickness, resulting in consistent extraction every time. They cleanly remove bitter oils and fines without imparting any flavor. Only the best of the coffee makes it into the cup!