E-max, 

This lithium disilicate ceramic comes in various translucency levels and can be used for very esthetic restorations. Flexural strength is approx 500MPa when properly bonded to tooth. Can be used for veneers, single anterior or posterior crowns as either layered with porcelain or monolithic. 

Standard composition: (in % by weight)

SiO2:57–80     Li2O:11–19     K2O:0–13      P2O5:0–11     

ZrO2:0–8         ZnO:0–8          other oxides and ceramic pigments:0–10