$64.99 EnerGel RTX Gel Pen, Retractable, Fine 0.5 mm Needle Tip, Blue Ink, Silver/Blue Barrel - Zerbee
Only decent 0.5mm pen I could find. Why is majority of pens 0.7mm? : pens
PIL31105 : Pilot® Pilot G2 Retractable Xfine Gel Ink Rollerball Pens - Extra Fine Pen Point - 0. 
