Bass matte finis paint + metal wear

Hey TBers

I am new to this forum so this post might be misplaced. Currently I own a beautiful Yamaha TRBX504. Recently I noticed some of the black paint of its matte Satin Polyurethane finish came off and the metal knobs seem to have some wear (see pictures). Any idea what caused this and how I can prevent this from happening in the future?

Bass 1.jpgBass 2.jpg Bass 3.jpg Bass 4.jpg
 
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