The Stealth Ink marker has a 15mm nib and a large barrel. It has a pump valve that allows you to control how much ink is released into the nib. 

The marker is easily refillable by unscrewing the lid.

Stealth ink is totally colourless when first applied, but after a few hours the surface will become dyed a dark brown / black due to natural light influence.

Stealth ink is also very hard to buff!