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Specifically, Valve gave every hand in Counter-Strike: Global Offensive a new look. Tonight's update includes new visual upgrades for all first-person arms, hands, and glove models in the game. You can see those above.

There were some additional changes made in tonight's update.

Changelog for CS:GO for July 7, 2016

GRAPHICSKILLER REPLAYSOUNDMATCHMAKINGLINUXMISC

(via Counter-Strike.net)