Cafec 1 Cup Dark Roast Coffee Paper Filter has the two-side crepe but the height of crepe is set to be lower. The surface area is a little larger than that of one-side crepe, that is, the adhesion area for fine powder is also larger. In the first half of brewing, because adhesion of fine powder is not so much so water can flow smoother, but in the last half, its adhesion becomes larger then it applies the brakes to water flow. The first fast and later slow water flow finish up the coffee with body and sweetness. No bleach, glues, chemicals or unnatural elements are added to the pulp. This is simply a 100 percent clean, eco-friendly, forest-sustainable coffee filter paper. This allows a smooth water flow and less chances of blockage during coffee brewing. Perfect for use with the cafec 1 cup flower dripper and hario v60 01 drippers. Specification: thickness 2: thickness 0.22mm, density: middle, two-side crepe (low-height). What's in the box: 1 x pack 100 filter papers.