Spectra 013G is a single action bottle feed airbrush for beginners and/or students and Spectra 033G is double action airbrush useful for fine detail on larger repetitive work for professional use. Both models feature the detachable glass bottle for quick color change and are internal mix. Spectra 013G and 033G are operated with air of 14 to 70 PSI. Spectra models are used for ..