Flexible Belly Ring Assorted Lot of 20 Navel Rings Flexible Bioplast 14 Gauge Piercing (20 Pieces) 20 Pieces 14 Gauge (1.6mm) Belly Ring. The Bioplast belly are very flexible and hypo-allergenic. Standard 1.6mm gauge (14 gauge) Two matching designer acrylic balls 5mm and 8mm.