GC Initial Zirconia Disk is an extremely high-quality Zirconium (Zr) Disk. This product is Cold Isostatic Pressed (CIP) for optimized physical properties. There are two types to choose from: Standard Translucency (ST) and High Translucency (HT). Standard Translucency (ST) is ideal for veneering. High Translucency (HT) is ideal for full contour, monolithic restorations.