Following the comments seen on this, I ventured to take to replace the earbuds from Sennheiser PX100 my who left in tatters. In fact, the diameter is smaller (45mm instead of 48mm) so you have to force them back enormously on helmet earphones. So I ripped one of the atria, and was finally able to get 2 others without too much damage (but a little anyway). Once implemented, actually it does not move but as it is very tense comfort is rather worse than the original earphones. I do not recommend this product for Sennheiser PX100: Cheap but not well suited.
