I loved these so much but lost one the first day as I didn't realize you needed to use the little plastic plugs with them, I thought it was just to keep them on the card thingy they come on.  The hook comes out very easily from your ear.  I was soooo bummed to loose it.  So if you buy these, please make sure you use the plastic stops with them.  They were the most expensive pair I bought and now have to save some money to get another set.  Not that they are overly expensive, just not in my budget at the moment.