I have often seen and tried earrings that claim to be hypoallergenic. I have a fairly big allergy to sterling silver and most other metals that leads to redness, swelling, pus, burning sensation, and hours of discomfort whenever I wear the "wrong" earrings. All my jewelry wearing life I've worn titanium (effective but expensive) for my fancy piercings and surgical steel hoops for my lobes. These studs, so cute and "normal" looking, are EXCELLENT for those who typically are unable to wear stud earrings! They've been in my ears all day with none of the pain or discomfort that I normally experience! I am so thrilled it came with so many pairs and in so many sizes, because they are excellent for everything from everyday life to more formal events! 10000% would buy again!