Chart Correction Pens?

What are the best chart correction pens that folk use?

Need one that is long lasting and that has a nib that won’t break easily.

http://www.trans-graphics.com/

we use the Staedtler Mars matic 0.18mmeasy to disassemble and add ink/change tips/clean

http://www.pilotpen.us/ProductGroup/186-Precise-RT-V5-V7.aspx