The Tec-9 | Sandstorm skin was added to CS:GO in the Arms Deal update on August 13, 2013.
This skin features a desert camouflage pattern consisting of sandy brown, dark brown, and black blotches overlaid on the base gray color of the gun.
As one of the older CS:GO skins, the Tec-9 | Sandstorm remains a relatively popular and affordable skin.