Aira 600128 DuraLux IPS e.max Type CAD /inLab HT B4 C14 5/Pk Equiv Ivoclar 626415. The Aira IPS e.max Type CAD blocks are composed of reliable lithium disilicate glass-ceramic, well-known for providing an exceptional balance between high flexural strength and natural, tooth-like esthetics. This particular block configuration is carefully engineered to achieve the optimal combination of opacity and natural appearance required for full-contour restorations like crowns and veneers.