Material: Nib size: 6mm 8 amazing liquid chalk markers with neon colors. After each run, cover the pen cover to the pen from evaporating. 8x Chalk Markers Chalk pens are filled with high quality dry wet erasable chalk paint! Chalk Markers are designed to be used on smooth and NON- surfaces! because Surfaces will absorb ink and leave ghosting. some chalkboards have tiny holes that will absorb water, which is not suitable for using this product. test on a small area first to see if it wipes off before continuing on your project. If the paint does not dissolve in water, please use soap or other mild cleaning fluid，and do not use markers on materials that absorb liquid because they might leave marks and shadows. Size: 14cm*1.4cm Before use, please shake it first, then gentle the tips. Each chalk pen comes with a reversible tip that can be used with a or chisel option. Chalk Markers Are Designed To Be Used On Smooth And NON- Surfaces! Because Surfaces Will Absorb Ink And Leave Ghosting. Some Chalkboards Have Tiny Holes That Will Absorb Water, Which Is Not Suitable For Using This Product. 8x Chalk Markers Chalk Pens Are Filled With High Quality Dry Wet Erasable Chalk Paint! Each Chalk Pen Comes With A Reversible Tip That Can Be Used With A Or Chisel Option.