An excellent, refillable marker for teaching/demos/posters, the Copic Wide Markers are 21mm (3/4") wide and feature hand cut, beveled writing edges. Copic Markers have been made in Japan for 15 years and have now gained great popularity in the US.
They are alcohol based, waterproof, and non-toxic. Writing edges are made of non-shredding polyester so they do not break down.
Along with this slanted tip marker, you'll also get a bonus flat (not angled) nib! Excellent for teaching and demonstrating. Beveled edges give unusually good calligraphic effects.
Colors below are approximate but are not exact matches to the true ink colors.