Piercing Collection - Hoop Models. Jewelry crafted in 3 sizes for all body locations, available in gold, silver, and more. 08mm 10mm and 12mmStandard piercing bar with 1mm or 1.2mm thickness. Stones pre-clawed to size and discounted for 3D printing. Simply print and create the mold. With anycubic, I use a 3% scale percentage to account for resin shrinkage. The stones set securely and won't come loose."