The Uni-ball UMR-83E is the 0.38 mm gel ink refill sold in the Uni-ball Signo 307 pen.
This refill was initially only sold in the Signo 307 but should also be sold in the Uni-ball 207 Plus+ when that pen is released in a 0.38 mm version (it was launched in August 2020 in only a 0.7 mm size).
Uni-ball UMR-83E Gel Ink Refill Information
|Street Price||Check Price|
|Pen Type||Rollerball / Gel|
|Ink Colors||Blue, Black, Red|
|Max Body Width||6.0 mm|
|Refill Length (cm)||11.2 cm|
|Refill Standard||Pilot G2|