Are roughness knots

Even if there are roughness knots on the lining, modern masters have long corrected these problems with the help of mounting foam, which is grinded and aligned when dried up. When using it from any lining, you can get a material comparable to the “Extra” class, and you already decide what to do — buy cheap material and improve it, while paying less or buy a lining at once, without wasting time and effort to improve quality.