These are sized a little bigger than a quarter and the hammered effect make them sparkle and catch the light very nicely (the photos don't do them justice).  They are lightweight and very comfortable to wear.  The locking mechanism actually snaps when it pops into place and hold these hoops tight.  I often wear headphones and headsets and they have never gotten in the way or been uncomfortable.

Added 3/31/17

I still wear these earrings all the time!  A couple times a week - easy.  I thought I lost one the other day and I was BUMMED!  I found it on the floor by my desk at work.  No damage - no flaws.  They still work like they did when they were new.  I must not have gotten them on right when I put them on.  I still love them!  They are perfect for work.  I need to wear a headset for a good part of the day and they have never given me the first bit of discomfort.  When I thought I lost one, I was on my way back for another pair.