SLF is a little bit curled fiber but really little bit and it is flat . It is very similar like polar fiber .But in our opinion, polar fiber is a little bit thicker and stiffer. SFL is thinner and softer than polar fiber.
The eyes are made by the most modern technology from the special resin of the excellent quality, which includes especially:
UV radiation resistance ( no getting yellow and colour stability supporting)
long time elasticity ( scratching and cracking by stroke resistance)
high transparency ( against usually used resins on the polyester base our ones reach...