This is because the surface finish looks similar to a picture of craters on the moon's surface. A material that fails early when dry testing will fail even quicker when it has been saturated in water. The surface finish may be a good indicator for judging quality when used in addition with breaking tests from a machine. It also costs around three times the amount of regular nylons. Without question, the regular mono is the best investment for most angling situations.
Regular mono comes in hard and soft nylons.
They both offer advantages for certain types of waters. May these findings aid you when shopping for leader materials.