Just doesnt appear that one of the design goals or intended uses was rough and tumble play. Liked this more than I thought. Its okay 9 Sizing Preference. Once you have worked it all out they are straightforward to fit, and easy to remove and replace. Very easy to install it has the hardware plus anchors if you?re going into a drywall. Tested on my fiancee and at the same volume I cannot hear the sound when hes wearing them. I suppose it would work for two bikes but like I said it feels slightly unstable when the bike is out as far as it can go. Yes, these earbuds are great quality,especially for the price. Los recomiendo sin duda.