... 4.Ability to be enameled, covered by PTFE (or others), anodized 5.Good reflectivity 6.High strength-to-weight ratio 7.Durability ... likely customer requirements. Thickness (mm)Diameter (mm)< 2.00normal: 190.5, 197, 203, 216, 222, 229, 235, 238,241, 245, ... , 489, 490.517For ovals1.75 — 3.00normal: 198x211, 242.5x159.5, 144x157, 160x173More pictures for your reference : Production Process:Ingot/Master ...