Fantastic ear piercing studs - glad to have received 2 sets of round post studs and 1 set of star post studs.  The back fastener is tight so not to have the stud pop out on its own (it happened to one of my original studs).  Thank goodness for Studex!!!  The stud ear piercing earrings are in high quality - they don't make my ears itch.  The stud earrings are handy so that my ear holes don't close up when I have not worn earrings for a certain amount of time.  Very happy with the merchandise.  Thank you Studex!!!