Black Strips?

Sorry for asking this Stupid Question, I want to ask you about a Black Strip which usually spotted on B77W’s wings


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Does anybody know what’s the Function of These Black Strips?

I don’t know, I’ve never noticed these

http://www.wings900.com/vb/1-1-civil-aviation/41631-boeing-777-300er-question.html

http://www.airliners.net/aviation-forums/general_aviation/read.main/875394/

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