Mackie write uneven surface, even water wet surface. '35 [Features] Since its launch, McKee of permanent marker. · It is a permanent marker of special applications for write firmly to the object that has not yet been covered by the McKee conventional products. · Equipped with ink can also be written on the surface was wet. · I write uneven surface metal, concrete, wood, etc., materials, glass, Styrofoam, plastic bottles, also craft tape. · Sturdy nib can be written also in rough surface such as concrete. And line width: 1.0mm~1.3mm