I cannot recommend these enough. I am just getting into them for drawing, painting and adding detail. They are great with watercolour pencils, I particularly like the Derwent Intense pencils. Plenty of videos on youtube from Derwent and others on how to get the most out of them. Watercolour isn't really my thing but I want to try as many media as I can and these are great for painting on the go, and for just jumping into an idea quickly without having to get brushes, water, jar etc. Have a go, really. Only £5 or so for a multipack of fine/medium and chisel tip.
See them at the manufacturers site;
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