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This question might be odd, but after watching one of Gilbert Strang's lectures I find I am jealous of his great, smoothly flowing chalk that never seems to get dulled down. Anyone know what it is, or a better replacement for the "crayola types"?

edit: Sorry if I did not tag this correctly, I can't yet make my own tags.

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You may be interested in this MO thread, though the problem to be solved there wasn't smooth flow but hands not getting chalky. See also this MO thread about good chalk in the UK. –  joriki May 23 '13 at 10:35

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