BIC Grip Stick Roller Ball Pen, Micro Fine Point (0.5 mm), Black, 12 Pens (GREM11BK)

Update pen gang.... I did buy the 0.5 mm version and it's a serviceable substitute. https://www.amazon.com/dp/B0006HVSXA?ref=ppx_yo2ov_dt_b_fed_asin_title