Joint: High grade PP , to be 360°swiveled , dismantled & assembled easily for cleaning Guiding ring: Low - friction treated rubber Center bolt : 304 stainless steel Adjustable joint knob: High grade PP with a moldin brass nut locking with center bolt Damper: To manually adjust air flow with a knob Dome / cup hood : High grade PP / PC Tube : φ75mm PVC 360° swing device : Enabling movement radius to max.1600m