Got these because Id developed a bad allergy to nickel in one of my ears and sadly had to get rid of all my cheap earrings and act like an adult with a real job and buy real jewelry.  I am pleased and will buy more from this vendor.

A couple of things.  It took about 48 hours for my nickel irritated ear to calm down after putting in these studs.  Now I have no issues. So if you do have nickel allergies, a resounding YASSSSS you CAN wear these without incident.

I got the 5mm studs, and didn't realize theyd be so small...I have no sense of size.  But I put them in anyway and will keep them and will also order a larger pair.

Before purchasing these, I read reviews where people complained about the size of the screw on back.  I had no issue with it.  Its the same size as the earrings I had back in the day when I got my ears pierced in 9th grade.  Apparently everything in the US has gotten larger over time including earring backs.  Im really happy they're smaller because I have small lobes and the giant backs (metal encircled in a plastic carrier) cheaper earrings have nowadays are sometimes gauche/peeking out  from the back of my lobes when I wore them.

And finally, if you're buying this for a gift and want to impress, go out and buy a different box to put them in, because as you can see from the pictures I posted, the packaging is rolling in HIGH cheesiness.

For the $$ I think it was a good buy and like I stated previously will buy again (except a little larger)