The most important thing is that the filter design fits your coffeemaker. However, the quality of coffee filters can also vary based on the materials it’s made of – with well-crafted stainless steel being particularly important. The right grips for safely handling the filter are also nice, and features that make them easy to wash are always welcome. While plastic components are an option, there are high-quality, BPA-free plastics that make great additions to these filters.