Uni PX-30

This popular valve-action marker has a 8mm chisel tip nib and is filled with weather resistant, opaque, oil-based paint. It has a refillable metal body, can write on nearly all surfaces, and dries with a glossy finish. Pro tip: Uni paint is known to separate, so be sure to shake these markers well before pumping the valve. A Blankslaps all-time favorite.