Probably a bunch of different ways, depending on the pattern could just be a gloss base part that gets masked and then has the soft touch paint applied. Mask removed, glossy areas remain.
If you wanted it in the raw plastic, it could be molded into the tool with a matte surface at one level, and then the recess can be polished to create the contrasting look. There would need to be a small step in the plastic as well.
You can also paint the part gloss black, then soft touch on top, and then do laser etching to remove the paint and expose the base part, or a secondary paint layer.