A flat-bottomed coffee dripper with three holes on its bottom. There is minimal contact between the Wave dripper and the Wave filter which allows a smooth coffee extraction. Kalita Wave drippers will help anyone easily make a delicious cup of coffee regardless of your pouring technique. Drippers are either made of heat-resistant glass or Stainless Steel. Kalita Wave 155 filters are compatible with the 155 drippers and Kalita Wave 185 filters are compatible with the 185 drippers.