下面是官方介绍
cool roller 411
Rollerball with visible ink level
Needle tip with free rolling ball
Suitable for carbon copies
Ink feed system
PP barrel guarantees long service life
Line width approx. 0.3 mm
liquid point 416
Rollerball with visible ink level
High-tech needle tip with free rolling ball
Suitable for carbon copies
Ink feed system
PP barrel guarantees long service life
Line width 0.3 mm
liquid point 417
Rollerball with visible ink level
High-tech needle tip with free rolling ball
Suitable for carbon copies
Ink feed system
PP barrel guarantees long service life
Line width 0.4 mm