Stable ink density and intense depth of colour, Clean lines with a smooth ink flow, Refillable several times with easy cartridge system offering long-term savings over traditional dry erase markers, Can be used on most non-porous surfaces such as whiteboards, mirrors, glass, windshields, etc. Extra fine bullet tip, No pumping or shaking, 1.3mm stroke width, Xylene free ink. 80% recycle content.