A year after ordering these earrings, I have lost backs. I emailed the seller, and was informed that the screwbacks were posted free the very same day. Kudos to them!
Liked their product, loved their customer service!

Been using the earrings for my daughter for the last 4 years, i have changed them a couple of times. They tend to get dark in the stem after a year and half or so. That works for me!