Partially crystallized, zirconia-reinforced glass ceramic blocks. Biaxial strength of 541 MPa and 3-point flexural strength of 495 MPa. Brilliant esthetics with integrated translucency, opalescence, and fluorescence. Marginal accuracy and high edge stability. Can be milled with very thin edges to prevent chipping. Indicated for posterior and anterior crowns, veneers, and inlays and onlays. Furnace required postmilling.