This sweet helix stud is available with a 1.2mm x 6mm or 1.2mm x 8mm 316L surgical steel barbell and has a 3mm ball which unscrews.
The little 925 sterling silver bow measures 8mm.
Bar - 1.2mm 316L Surgical Steel
Length - 6mm (1/4") or 8mm (5/16)
Ball Size - 3mm Screw on Back Ball
Design - 925 Sterling Silver
Only suitable for use in healed piercings
Range - Helix/Tragus/Cartilage/Upper Ear Piercing Bars