This POSCA PC8K Marker contains quick-drying ink which is permanent on porous surfaces but removable on glass. They can be used to write on a variety of surfaces making them a handy tool for any writer or artist. The broad chisel tip is perfect for leaving bold and heavy markings that will stand out. This marker has a Broad Chisel tip measuring 8.0mm can both cover large areas and draw neat curves. You can use it to mark on paper, metal, glass, fabric, minerals, canvas, ceramic, wood and plastic. The ink is water-based and becomes permanent on porous surfaces. You can blend these markers when they are wet or overlay them when they are dry. POSCA tips can be removed and washed by rinsing it under cold water or leaving it to soak overnight. The ball inside the barrel mixes the paint, giving an even consistency, while the cap provides a tight seal ensuring protection and longevity of the tip. This marker is ideal for making bold markings or sign writing for both professional and personal use.