Crystal Materials: 99, 996% of Al2O3, High Purity, MonocrystallineCrystal quality: Block marks, twins, Color, micro-bubbles and dispersal centers are non-existent.Diameter: 2", 3", 4", 5" ~ 7"In accordance with the provisions of standard productionThickness: 250±15um, 330±15um, 430±15um, 500±15um, 550±15um, 650±15umIn accordance with the provisions of standard productionOrientation: C- plane , A- ...