Hypoallergenic metal-free clear bioflex BCRs (ball closure rings/captive bead rings). Available in 8mm, 10mm and 12mm internal diameters.
8mm/1mm gauge, 8mm/1.2mm gauge and 10mm/1mm gauge and gauge rings have 3mm push-fit balls.
12mm/1mm gauge, 10mm/1.2mm gauge and 12mm/1.2mm gauge rings have 4mm push-fit balls. 1mm or 1.2mm gauge?
1mm/18 gauge BCRs are good if your piercings have shrunk or were originally pierced with a smaller size. 1.2mm/16 gauge is the most common size ears are initially pierced with.