F-4 Illustrator GS is anodized with the ACI
Graffiti Series anodizing. This version has all the regular features
of the standard model, plus it has a pressure gauge and High Volume
Cell. The barrel is the ACI Zero Gravity Combo Barrel. It
comes with the Sub Zero 4 Stage Expansion Chamber.
F-4 Illustrator DX is
similar to the Gs except it does not come with the pressure gauge,
High Volume Cell, and it is not graffiti.
This is the standard F-4
illustrator. Please note the standard bottom line. Though many
people might not see this as important, I love bottom lines, and find
bottom line set-ups to be the most comfortable on marker set-up.