The uni-ball Chalk Marker writes on and wipes off making it the perfect tool for writing on non-porous surfaces such as chalkboards and glass. Perfect for pub, and restaurant signs, its broad bullet tip makes this pen a great all-rounder, good for hand lettering and bold, robust drawings. Not suitable for porous surfaces. Features Stroke width (max) 2.5 mm Stroke width (min) 1.8 mm Tip type Bullet tip Point type Medium Product colour Multicolour Number of colours 4 colours Writing colours Metallic Packaging content Quantity per pack 4 pc(s) General Product family ChalkGlass