Gravity feed allows you to work with lower air pressures, so you can paint slowly and capture fine details or cover broad backgrounds. For use with thinned artist acrylics and vinyls, and lighter viscosity materials. Recommended for advanced modelers, artists and illustrators. Each set includes model 100 LG series airbrush with permanent top-mounted color cup and fitted cover (holds 1/3oz/10.5cc of color), hanger, extra needle, protective cap, wrench and padded case. brushes can be adapted to Fine, Medium or Heavy needle assemblies, sold separately.