Static dissipative polyurethane hose strengthened with copper plated spring cord helix. attribute Ultra-smooth inside wall ensures tremendous airflow Very flexible and strain resistant Spiral co-extrusion engineering structure Permanent and humidity-independent ESD (electrostatic discharge) protection 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 precisely prohibited in the trachea, solely well matched for vacuuming Length: 1m Inner diameter=20/25/32/40/50//100/150/200 mm One