Writes on rubber, steel, glass, wood, plastic, plexiglas, photographs - literally anything as long as it is not wet or greasy. Then, cleans off easily with a little rub or a “spit-n’-swipe”. Not abrasive, so won’t scratch. Won’t gouge stock when laying out checkering/inlays/inletting. Sharpen to super-fine point for most precise work in engraving, checkering, carving, machining, and design. SPECS: 7' (17.9cm) long. White or Bright Yellow. Sold in paks of 6 of 1 color. Assortment contains 3 each.