Write confident and razor sharp lines with Avery Marks A Lot ultra fine markers. The sturdy yet thin .5mm marker tip stays firm and does not fray over time. This remarkable ink sets in quickly when written but won't become dried out if you forget the cap. Leave the cap off the marker for up to 30 minutes and you'll still be able to pick it back up and keep writing. The versatile permanent ink resists wear, fading and water exposure and is the best choice for every project. These markers work on almost all surfaces including paper, cardboard, metal, PVC pipes, concrete walls, plastic and ceramic. Whether it's a bullet journal, planner, water bottle of phone case, these ultra fine permanent markers can go wherever you need them. Avery Marks A Lot markers are non-toxic and low-odor. Our ink is ACMI certified as non-toxic and conforms to ASTM D4236. If you need help with ink removal from skin or fabric please contact our consumer care team by calling (800) GO AVERY.