Milling Blocks Medium Translucent AP CAD S are mainly composed of lithium disilicate. These CAD/CAM blocks are easy to mill! The simple crystallization process makes this material ideal for chair side applications such as veneers, inlays, onlays, monolithic bridges, anterior crowns and posterior crowns. AP CAD S milling blocks are available in High Translucency (HT) , Medium Translucency (MT) and Low Tranclucency (LT). Set contains 5 blocks!