Material:Made of G23 Titanium . Hypoallergenic, Nickel-free, Non-Toxic. it will never corrode and turn green.Lightweight,Wearing without any weight-bearing sensation.Size:Tunnels, Tapers Guage 4G/5mm,2G/6mm,0G/8mm,00G/10mm,1/2"(12mm),Five sizes in total.Earrings Set:2 pcs of each size.4 pcs of Single size kit,20 pcs of multi size kit.Using: unscrew the threaded tunnels at one end, insert it into the ear and screw back on when it will not fall out of the hole .Wearring:Wide application,can be used for Nose, Earrings,Cartilage ect.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.