I bought 2 sets in case of any errors. The first package failed miserably. It didn't stick to the earpiece and the fit left a lot to be desired. Because of these flaws, I don't know if the final product actually isolates external noise from the sound produced. Looking at other reviews I'll try an alternative method and see where it goes. I'll check again after the alternate method is complete. Round 2; Instead of a set of 3, I divided the components into two equal parts. First glued to my ear and then drilled a hole in the earpiece with a drill. I plugged in my headphones and everything worked. You may have to glue the earbuds to the headphones, but they fit well and sound good.
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