Each stud is about 1/4" wide. Sterling silver. Nickel-free.
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The backs do not stay on at all. They are so slippery on the posts. They slide off with ease and thankfully I haven't lost any yet, but unfortunately I rarely wear them because of this. I have a couple other N&S post earrings with the same issue. They come with rubber stoppers on the earrings (in addition to the backers) when they arrive but you cant actually use both because the post isnt long enough. I hope they change the backers and posts soon because for the price of these studs, I feel like they shouldnt fall out easily,