Андрей 545, 
это кондуктор для технологических отверстий
вот, кста, в тему изысканий с частичным снятие краски
https://www.strat-talk.com/threads/paint-removal-guitar-needs-to-breath.9867/"Let your guitar breath. For this,
you should take away the paint at any location that can´t be seen. One critical location is the surface underneath the bridge of a Strat. Eric Johnson knows what he's doing when he does this to all of his guitars. You can also completely remove the paint of the inside of the pickup cavities and the entire surface underneath the pickguard".
"Fender has an
interesting little detail on the Eric Johnson Strat.
They sand away the paint on top of the inertia bar (a.k.a "tremolo block") that is attached to the bottom of the tremolo bottom plate for a better tone transfer. At first
I thought that it was voodoo and marketing, but later I had to take out the inertia bar on one of my own Strats, and since it was out anyway,
I gave it a try and the result was stunning. The tone is stronger --
it was like "freeing" my guitar. So give it a try and listen to see if it makes a difference on your guitars."
но я лично не особо верю во все эти теории. думаю, это все психоакустика. Это как с тестом- когда людям включают одну и ту же запись гитары (перед этим давая попить холодной воды или горячий чай/кофе). По итогу, после горячего напитка всем тот же звук показался округлее и теплее
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