Body Candy Stainless Steel Shimmer Gray BCR Captive Ring 18 Gauge 1/2" 4mm Gauge 18 gauge; 1 millimeters Diameter 1/2 inch; 12 millimeters 316L stainless steel curved barbell belly ring Captive bead ring features a purple 4 millimeter ball BCR captive rings can be used for mulitple body piercings