PERFECT FOR BEGINNERS AND PROFESSIONALS: You'll find Kaila pour-over products in the world's top specialty cafes and professional coffee-making competitions. But our products are also great for pour-over beginners. Cone drippers and filters require perfect grinds and pouring technique in order to prevent stalling and over-extraction. The wave's flat bottom design, on the other hand, maintains a wide and even coffee bed, allowing water to permeate and leave the dripper evenly through three holes.