Which type of filter is NOT commonly used for brewing coffee?

The type of filter that is not commonly used for brewing coffee is glass. While glass is often used in the construction of coffee brewing devices, such as carafes or coffee pots, it doesn't serve as a filter material itself. Common brewing filters are typically designed for their ability to separate coffee grounds from liquid efficiently, which glass cannot do.

In contrast, woven wire, cloth, and paper filters are specifically designed for this purpose. Woven wire filters are reusable and allow coffee oils to pass through, while cloth filters offer a balance between reusable and filter types, contributing to a smoother taste. Paper filters are widely popular for their convenience and ability to trap fine coffee grounds and oils, resulting in a clearer cup. Thus, glass does not play a functional role as a filter in the brewing process, making it the correct choice in this context.