Pilot Super Color White Paint Markers offer brilliant, opaque, permanent marking on almost any surface. Xylene-free ink.
SCWEF Extra-Fine Bullet Tip gives 0.5mm line.
SCWF Fine Bullet Tip gives 1.0mm line.
SCWM Medium Bullet Tip gives 2.0mm line.

Note on operation: Shake several times, then press the tip down 3 or 4 times on scrap paper to start the ink flowing. Cap the pen tightly and store horizontally.