CHF1.35 per piece for 4 units
Pentel EnerGel refill
Gel mine, Green, 0.70 mm
Questions about Pentel EnerGel refill
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More blue, so that it looks like blue and not black. Not too light, not too dark.
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The pen has a ball of 0.7 mm, which gives a line width of 0.35 mm. So both are correct. There is a finer version with a 0.5mm ball, which has a line thickness of 0.25mm.