Marsh®88 markers mark on any surface – cardboard, wood, fabric, even non-porous surfaces. And now they are available in both xylene and xylene-free (alcohol based) ink.
Marsh®88 markers won’t fade, even in sunlight.
Valve markers have been in use for over 50 years. When the tip is pressed down, it pushes onto a spring loaded plunger which opens the valve, letting the liquid through to the tip and allowing the user to regulate the quantity of liquid dispensed. When the cap is left off, the tip can be re-primed, so you can use all the liquid inside the marker.