spec: material: boron carbide, tungsten carbide,alloy dia of orific: from 2.6mm-13.8mm ... ,and sand blasting , it feature long using life ,boron carbide,tungsten carbide,Alloy zirconium are viable at JTCCO2008JTC PY alloy zirconium ... hour can be 800H if working 8 H continuous.2008WC tungsten carbide nozzle is the most hardness nozzle, density:8.0g ...