Enjoy low-odor markers that are ACMI certified and conform to ASTM D4236, meaning they’ve been independently tested and meet strict safety standards for art materialsEnjoy long-lasting markers with water resistant and wear resistant ink that dries quickly when applied and is designed to endure harsh conditionsControl your line width easily with the durable chisel tip markers that allow you to write in various sizes and won't frayNo need to worry about the marker drying out quickly; Marks A Lot permanent markers won't dry out for up to half an hour without a capUse these yellow permanent markers to write smoothly on almost any surface including cardboard boxes, PVC pipes, concrete walls, plastic bins and moreACMI certified. Conforms to ASTM D 4236.