I purchased these earrings for my child because the original ones from the ear piercing store fell out.  I then purchased new ones from a jewelry store that had screw butterfly backs.  They were hard to get on and eventually one fell out and we lost it.  I purchased these on Amazon because of the price and speed of delivery.  I was very pleased with my purchase.  They were easy to get on my daughter.  The screw backs were not difficult like the butterfly screws.  They have been in her ears for over 8 months now and we have had no issues.  I highly recommend these to people with young children with pierced ears.