I was looking for 18K gold studs for my daughters and couldn't find any with screw backs -- they are all 14K.  Because these were a good price, despite not being screw-back, I bought these for my 3 and 5 year old daughters.  They are very pretty and the size is just right (would definitely not get any bigger for children this age).  They seem to be of good quality.  The posts are just a tad bit short which are ok for kids but I think they'd be too short for me as I'd worry that they'd come off accidentally.  The butterfly closures do not hold that well and one earring actually fell off my daughter at school.  I miraculously found it on the ground outside, and I substituted for another more grippy pair of backings, and now check them every night to make sure they are snug.  Overall, good for the $.