The SI airbrush is single action but also internal mix which keeps operation simple but allows for better detail than external mix models.  The SI single action allows the user to achieve fine lines down to 1/32 inch and wider patterns of up to 1-1/2 inches.  .  The best uses are those requiring more basic spraying like solid coats, uniform lines or stencil work.  Clean up is as simple as spraying your paint cleaner though the airbrush.  The SI is used for many applications including hobby, craft, chip and ding repair, taxidermy, ceramics, cake decorating, tanning, tattoos, etc.  The SI airbrush is made in the US.

SI#3L Includes:
     SI#3 Airbrush Only

Features:
•Airbrush Made In The USA
•Three head sizes for any application
•Highly polished & hardened stainless steel needles for long life and reduced clogging
•Line adjustment screw that can be used to pre-adjust paint flow
•Solvent proof PTFE needle packing allows spraying of water & solvent based paints
•Removable needle protector for fine detail spraying
•Chrome plated body

Specs:
Part Number:SI#3L
Type:                 Single action, Internal mix, Siphon feed
Head Size:          Size 3 (.74mm)
Fluid Packing:     PTFE - Can spray solvent or water based fluids
Air Volume:         20 PSI @ .5 CFM
Air Pressure:       20-75 PSI            
Air Inlet:              ¼"-20 Thread (Paasche thread) - adapters available
Bottle size:          1/4oz to 8oz bottles available
Spray Pattern:    1/32" to 1-1/2"
Weight:                1.1 Lbs
Finish:                   Chrome plated body