quoted from the site it tells you about the un polished finish
As with Mora's Companion Knife, the HighQ Robust is an excellent knife to use whilst learning basic bushcraft techniques (being sturdy enough to withstand harsh treatment), while still being of a high enough quality to use once you are more proficient in knife work. Indeed, these Mora knives are used throughout the year by Woodlore's experienced instructors and assistants. The blade features a single flat bevel and a half tang, which is double-moulded into a large handle for improved strength. Furthermore, the high-friction grip has been ergonomically designed, making it an efficient, comfortable and safe knife to use. Please note that the back of the blade features an un-polished finish.