Material:Made of G23 Titanium . Hypoallergenic, Nickel-free, Cartilage stud piercings are Non-Toxic. it will never corrode and turn green. Size:20G(0.8mm)Pin Thickness, 6mm Bar Length With 4mm Flat Back ,CZ dia:3/4/5/6mm,you can wear different CZ size on different occasions. Earrings Set:1 Set=4 Pairs CZ Stud Earrings, 4 Pairs 4 Different Sizes Clear Cubic Zirconia Stones, 3/4/5/6mm Silver Tone, Perfect for Women and Men. Wearring：The Internally Threaded in design is easy to put in or take out. Stud Earrings Featuring Sparkling CZ Nestled in 4 Prong Setting, Flat Back Earrings are Designed to Protect Neck from Painful Pokes; Barbell Style, Perfect for Earlobe Stud Earrings, Cartilage Stud Earrings. Ideal Gift These Jewelry Earrings are Ideal Gift for Wife, Sister, Mother and the One You Loved on Valentine's Day, Anniversary, Birthday, Graduation, Thanksgiving Day and Christmas Please Feel Free to let me know If You Have Any Problem,We Will Solve for You Within 24 Hours.