Precision Machining & CNC Machining of Hard Materials Valley Design is a custom fabricator of precision machined parts from Glass, Pyrex, Quartz, Fused Silica (SiO 2), Sapphire (A Plane, C Plane, R Plane), Aluminum Oxide (Alumina, Al 2 0 3), Aluminum Nitride (AlN), Silicon Carbide (SiC), Boron Carbide, Steatite, Silicon, Zerodur, Macor, composites, and other ultra-hard materials.