The Carmel Refillable Ballpoint Markers is a perfect marking tool for welders, street artists, construction workers or adventurous artists. This marker works best on hard, flat and non-porous surfaces. This marker works on oily, dry, or wet surfaces and comes in two forms; The Pump version has a pressable rubber ball at its base to control paint flow. The Bottle version consists of a squeezable bottle that applies paint through a press-activated metal ballpoint tip.. Both Markers are best used with Carmel Paint Refill for Ballpoint Tip Paint Markers. Paint not included (sold separately).