Coffee filters number 2 Bratek Brattek coffee filters are made of unbleached paper, which guarantees that the full taste and aroma of coffee is preserved. Thanks to the high quality of paper and a special way of gluing, the coffee brewed in these filters is extremely tasty, strong and smells only of coffee. Bratek filters are available in two standard sizes: number 2 (smaller) and number 4 (larger), which allows for a perfect fit to different brewers. By choosing Bratek filters, you can be sure that every sip of coffee will be a real pleasure.