Won't dry out, even if you leave the cap off for up to half an hour! Bold, quick-drying, water- and rub-resistant permanent ink provides high visibility marking on virtually any surface: cardboard, metal, plastic and more. Durable, versatile tip allow you to easily control the width of your marks: from fine and thin to bold and thick. Low-odor and nontoxic—safe for the office, classroom and home. Value Pack24 for the price of 20! Marker Ink Type: Permanent; Marker Tip Type: Chisel; Marker Tip Size (text): Broad; Marker Tip Size (numeric): 4.8 mm.