Blaze skins are painted solid black and the front is adorned with bright red and orange flames. This skin family currently has two members in its collection. The skins were added into the game in 2013, a few months apart. They are part of The Dust Collection and The Mirage Collection. The skins in this family have two exteriors, Factory New and Minimal Wear and one of them has the Souvenir option.
The UMP can be found for around the $20 - $30 mark. Desert Eagle is more expensive and costs around $500.
Check out other CS2 skins families: