INKZALL™ Highlighters feature a durable tip that stays sharp longer, with non-smearing, bleed-resistant ink. Non-toxic and ASTM D 4236 certified, they’re perfect for architectural drawings, labels, and office paper. The anti-roll body provides a secure grip on smooth surfaces, while the helmet clip and lanyard hole make them easy to attach to helmets, belts, trousers, or overalls—ideal for construction sites and on-the-go use.