There are many kinds of coffee filters on the market, but it would be a big mistake if you think it is just a paper and that there’s not much difference between which paper filter you use. The CAFEC filter paper has “Two-Side Crepe” technology. Some other paper filters on the market has crepe on one-side only but the CAFEC paper features the “Two-Side Crepe” through their original paper-making technology (Air-through dry). Thanks to the best balance of the height of crepe on both sides, it can keep the air layer between paper and dripper separated so water can flow at the ideal rate. The CAFEC “Two-Side Crepe” is proof of that coffee filter paper is not just a paper.