Chronos skins have their own unique paint job which depicts a hydrographic of numerous watch mechanisms in various different colors which give the skin a psychedelic look. Currently, the only member of the Chronos family of skins is G3SG1 | Chronos which was added to the game in May 2015 as a part of the Operation Bloodhound update. The skin comes in four out of five possible exteriors excluding a Battle-Scarred version and is a part of The Gods and Monsters Collection.
Check out other CS:GO skins families: