Static dissipative polyurethane hose bolstered with copper plated spring wire helix. attribute Ultra-smooth inner wall ensures effective airflow Very bendy and strain resistant Spiral co-extrusion engineering structure Permanent and humidity-independent ESD (electrostatic discharge) defense Surface resistivity grade: 109-1010 Ohms/Square Wall thickness=0 High temperature resistance: -20-120℃, Application: Industrial Vacuum / Engraving Machine / Woodworking / Ventilation Note: fluid is strictly prohibited in the trachea, totally correct for vacuuming Length: 1m Inner diameter=20/25/32/40/50//100/150/200 mm One