High quality blast nozzles with Venturi Liners significantly increase the speed of the abrasive particles on their way out (200-300 m/sec), which improves the efficiency of the surface treatment by 50% if compared with the usual straight nozzles and reduce abrasive consumption by 40%. The inner nozzle insert is made of boron carbide, the most resistant to the “aggressive” abrasive materials. The nozzles have impact-resistant body made of high quality aluminum and rubber coating for absorption and shock protection.