Crown of thorns ring ready to print, four size model.inner diameter:-16.55mm-17.5mm-18.1mm-18.80mmapproximative metal weight:18kt 17.5mm(3.2gr) 18.1mm(3.7gr) 18.80(4.00gr) 16.55mm(2.80gr)model made using rhinoceros and zbrush.stl printable format available, please contact us for any question or different size.thank you!!