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 materials Enjoy long-lasting markers with water resistant and wear resistant ink that dries quickly when applied and is designed to endure harsh conditions Control your line width easily with the durable chisel tip markers that allow you to write in various sizes and won't fray No 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 cap Use these yellow permanent markers to write smoothly on almost any surface including cardboard boxes, PVC pipes, concrete walls, plastic bins and more