For those really big marking jobs, this super-sized marker has an aluminum barrel and 5/8in. wool tip for broad strokes. Ink lays down an extra-wide, chisel line with just a single stroke for high visibility. Excellent for posters, signs and charts, ink is water-resistant and permanent on most surfaces. Sharpie Markers & Highlighters part of a large selection of office supplies. Sharpie(R) Magnum 44(R) Permanent Marker, Black is one of many Permanent Markers & Marker Pens available through Office Depot. Made by Sharpie.