10 pack of Pica 545/24-10 classic pencils for all the high quality, thick graphite filling pencils for markingon almost all surfaces. They are erganomically triangular shaped aand have rich marking lines even on wet surfaces. -Thick, high-quality graphite lead -For marking on almost all glossy surfaces, like plastic, tiles, ceramic, metal etc -Rich marking lines even on wet surfaces -Markings are easily wiped clean with a damp cloth