The single-layer coffee filter is easier to clean than the double layer, can be dishwasher safe and hand-washed,and comes with a brush for your convenience.
Widely compatible with coffee cone filter holder for most mugs & kettles.
Also with the three holes at the flat bottom, its dripping is slower than the plastic, one-hole drippers.
Which maximizes the flavors with greater flexibility and room for brewing.
The perfect dripping time allows more flavor to be soaked up by the coffee grinds to make a cup of much better, richer coffee.