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What does he always have on his arm? Some kind of tape? What is it for?

Apparently its athletic tape for his arthritis according to this video https://youtu.be/JdVeaLb-Ups?si=Bb6f-rrCofGGSge1 at around 1:00

Kang kang plays the game 6+ hours everyday so overtime his right hand becomes numb and sore from grinding deathmatches