The uni-ball Chalk Marker range is water-based and gives vibrant colours that are perfect for striking-catching designs. Ideal for non-porous Chalk Boards or glass in pubs, cafés and restaurants. They are also rain resistant, making them great for use outdoors. The ink can be easily removed from non-porous surfaces using a damp cloth or mild detergent.. Features. Suitable for materials. Glass, Metal, Plastic, Wood. Housing shape. Round. Housing material. Plastic. Housing colour. Multi. Stroke width (max). 2.5 mm. Stroke width (min). 1.8 mm. Writing colours. Blue, Green, Orange, Pink, Red, Violet, White, Yellow. General. Product family. ChalkGlass. Packaging data. Package type. Blister. Packaging content. Quantity per pack. 8 pc(s)