Crush resistant aluminium barrel Ensures clear writing on various surfaces such as, wood, plastic, rubber, metal and glass Valve action flow 2.3mm acrylic fibre tip Fast drying, water and fade resistant Water resistant RoHS Compliant (Restrictions of Hazardous Substances) VOCs Compliant (Limit Release of Volatile Organic Compounds) Artline 400XF Paint Markers are ideal for all types of permanent marking, from porous surfaces such as cardboard and wood to non-porous surfaces such as steel and glass. .