FriXion Ball Clicker 0.5mm Erasable Gel Pen - Blue
The FriXion series from Pilot has a 0.5mm ballpoint tip and writes smoothly. It is filled with Pilot's special erasable ink. The Clicker model is very similar to its FriXion Point counterparts, except it is retractable and you will never have to worry about misplacing the cap.
Made a mistake? No worries. Simply turn the pen upside down and use the small rubber tip at the end to remove the word. There will not be rubber residue on the paper. It works like magic. Be sure to keep the rubber tip clean to avoid smudging.