Bar thickness:18G(1,0mm), Bar inner length:1/4"(6mm), 5/16"(8mm),3/8" (10mm) and 15/32"(12mm),Plain balls:Φ3mm. Sold as 4 pairs. 6AL4VELI ASTM F-136 titanium implant grade material.Hypoallergenic and nickel. Advantage: ① Titanium material is durable,lightweight and safe,half the weight of steel. ② Excellent biocompatibility fit for "sensitive ear". Great for people who normally have reactions to steel metals. ③ 4 selection of different inner length,fit for more body parts. Using: ① Externally threaded Implant titanim bent barbell, balls was very easy to screw on.They are easy to use and comfortable to wear. ② Fit for 1.0mm thickness setpum/eyebrow/conch/lip/daith/helix/belly/sanke eye piercing. Simple rings so it matches any outfit.This item be used as a great personality for birthday, Halloween day, Christmas day, Anniversary day, Valentine's day and holiday. Any problem or issue, please feel to contact us via message directly. You will receive 4 Pairs 16G Titanium Bent Curved Barbell Banana,Bijoux Sourcil Nipple Navel Eyebrow Ring Piercing inner length 8mm/10mm/12mm