Product Description This specialty marker will bleed through oil based paints and primers. Marks are permanent on non-porous surfaces. This valve action marker is available with a bullet fiber nib or chisel nib. For oil-based primers Only Remember to keep the tip saturated for proper bleed-through Marks will bleed through oil based primers Patented Pump Action Works on unpainted metal Large ink supply & aluminum barrel Conforms to ASTM 4236 Marking Range: -40° F to 150° F (-40° C to 66° C) Stroke Size:  3.2 mm Bullet Nib, 4.8 mm Chisel Nib This specialty marker will bleed through oil based paints and primers. Marks are permanent on non-porous surfaces. This valve action marker is available with a bullet fiber nib or chisel nib. For oil-based primers Only Remember to keep the tip saturated for proper bleed-through Marks will bleed through oil based primers Patented Pump Action Works on unpainted metal Large ink supply & aluminum barrel Conforms to ASTM 4236