2 pieces/size 316L Surgical Steel Ball Closure Captive Bead Ring. 16G (1.2mm): 4mm, 5mm ball. 12G (2.0mm) 14G (1.6mm) 10G (2.4mm) - 9/16" (14mm) x 4mm, 5mm ball. - 5/8" (16mm) x 5mm ball. - 3/4" (19mm) x 5mm ball.
eBay