Professional markers feature a durable chisel tip to last longer than standard Sharpie tips when used on abrasive surfaces. Quick-drying ink is permanent on just about everything including wet oily abrasive and nonporous surfaces. Nonslip barrel allows you to easily remove the cap even while wearing gloves. Oval design prevents marker from rolling off flat angled surfaces. Permanent markers with blue ink are perfect for writing on outdoor gear sports equipment backpacks and more.