Internally threaded curved barbell, 4 gauge Home » Curved Barbells | Internally Threaded Jewelry | Large gauge | Male piercing | Stainless Steel Shown: 16mm curved barbell. Material: 316L surgical stainless steel, implant gradeGauge: 4 Type: curved barbellLength: optionalBall size: 5/16" (8mm) Retail Price: $8.24Your Price: $ Length: ----- Choose One -----1/2" (13mm)5/8" (16mm)3/4" (19mm)Quantity: