Get the job done with this 4 pack of Avery 29848 Marks A Lot UltraDuty markers with bullet tips. Built for situations where standard permanent markers just aren't enough, Avery Marks A Lot UltraDuty markers are perfect for construction sites, warehouses, workshops & more. The bold fast-drying ink works great on plastic, wood, metal, corrugate & concrete. The durable 1mm bullet tip also works on abrasive, dusty, wet & oily surfaces without clogging. The sharp bullet tip also allows you to write lines with consistent widths for a cleaner look. Specially engineered to resist water, abrasion & smearing, the heavy duty ink makes sure that your writing will last through even the harshest of conditions. The durable ink is designed to last & won't dry out when the cap is left off for up to 72 hours. The cap also features a useful clip to help keep the markers secure in your pockets & to prevent rolling. Includes 2 black markers, 1 red marker & 1 blue marker. Please Note: The industrial-grade ink has a stronger odor than traditional permanent markers.