AZDENT Dental ST-ML Multilayer Zirconia Block Seven Layers Natural Shade Gradient 98mmZDENT Dental ST ML Multilayer Zirconia Block Seven Layers Natural Shade Gradient 98mm. Safe high quality raw material. Excellent aesthetic and strength. Seven layers natural shade gradient, the preferred and most common multiplayer material used for posterior restoration. FDA approved. Note: We have many other dimensions in our factory. If you need them, please contact our customer service team. Overview Safe high quality raw materia Excellent