The 4095 Chalk Marker is great for non-permanent designing, decorating and writing on non-porous surfaces such as windows, dark boards, glass, plexiglas and mirrors. Its round nib releases highly opaque liquid chalk, allowing you to create distinguished markings on smooth surfaces like blackboards, mirrors and glass. Not only suitable for creative crafting at home, but also a favorite tool in businesses like restaurants, bars or the glass industry. Change your message and clean up with ease! It can be wiped off virtually all non-porous surfaces with a damp cloth. This set includes black, red, blue and green. Details:Includes an assortment of colorsRound nib features a stroke width of 2mm to 3mm depending on angle and pressure4 chalk markersWater based, lightfast liquid chalk is opaque for excellent coverageNeutral smellShake before use, remove cap and pump