Uni-ball Signo 307 Gel Ink Pen [Refill] 0.38mm 0.5mm 0.7mm

Name of product: Uniball Signo 307 Gel Roller Pen Refill 0.5mm/0.7mm /0.38 mm(1pc)
Refill Tips: 0.5mm / 0.7mm /0.38mm
Model: UMR 83E /85E / 87E
 
== Made In Japan==
√ Smooth writing due to low viscosity ink
√ Fast drying suitable for left-handed
√ Darker lines from fortified ink
√ To accommodate this hybrid ink, Uni updated the mechanics of the pen with a "twin ball" system.
√ The built-in spring pushes the ball at the pen tip forward, preventing the ink from leaking when not in use.