CS:GO developers regularly determine which workshop skins will eventually make it into the game. When selecting skinmakers’ creations for the next case, they determine their rarity – that is, the probability with which a particular item will drop out. Interestingly, this characteristic is not set arbitrarily – it depends on the appearance of the skin and the features of its design. 
For example – distribution of rarity of skins in the “Dreams and Nightmares” case
When it comes to selecting skins for CS:GO from the workshop, Valve pre-determines which weapons will go into a specific case, so community members can create their work with this in mind. In addition, several skins made in the same style are usually not used in the game at once. For example, four skins from the Neo-Noir series appeared in the game between 2017 and 2020, and the design for the UMP-45 from the same author is still waiting in the wings.
Military quality
Military quality skins can be similar to each other. They often use shades of the same color without contrasting combinations. This category includes skins that are difficult to distinguish from each other at a great distance, and all the details are visible only to the player. Often, such skins use a texture that evenly covers the entire surface of the weapon, without emphasizing individual details.
Prohibited
Skins with a more contrasting pattern fall into this category. They use bright combinations of colors so that the pattern can be distinguished not only by the player himself, but also by those who are next to him. Sometimes optical illusions appear in the design of such skins, for example, to create a three-dimensional effect on individual parts of the body.
Classified
Skins from this category are recognizable even from afar due to their contrasting coloring and expressive color combinations. Looking at the skin that he holds in his hands, the player can see interesting details of the pattern, which is not just superimposed on a three-dimensional object, but is adjusted to the shape of the weapon. Those who observe the player from the outside can easily recognize that he has a real rarity in his hands.
Secret
Skins with this characteristic – the most recognizable. They are truly unique, so not only nearby teammates, but also opponents can recognize them. In addition, it is most noticeable from the skins from this group that they were developed for a specific gun. If for military quality a simple memorable pattern is enough, for secret it requires careful elaboration, taking into account all the details. For example, a characteristic feature of the Neo-Noir series is the image of a girl, but her outline changes depending on the shape of a particular type of weapon.
It is interesting that these criteria do not apply to the skins that Valve itself develops. Unlike colorings selected from the workshop, they may look too simple for their rarity or, conversely, seem too bright. But in any case, get classified or secret skins by opening cases – not easy. If you don’t want to rely on chance, use the Lis-Skins.com store to purchase any skins for CS:GO at affordable prices.