三菱鉛筆 Mitsubishi Pencil Ballpoint Pen Refill Core Replacement Jet Stream Prime Multicolor Multi-function for 3 Pieces 0.5mm Black Red Blue 164 145 002

非常に書きやすいです。

Very smooth ink flow, excellent writing ability!

Better than what was originally in my 3 in one pen (lost the black one though)

近くの文房具売り場で青の取り扱いがなくなってしまい、こちらで購入できて助かりました。 替え芯なのに他のボールペン2本買える値段しますが書き心地を考えると格安です。 数千円するペンの替え芯なのでさすがの書き心地。

This Jetstream hybrid ink has good color saturation and writes on just about any surface. It dries quickly and doesn't smudge easily. Sometimes it does skip but it's not often and still performs better than any other ink I've tried. I use blue and red in my Rotring 600 3-in-one that I carry and use daily and is the best ink I've found. My only complaint is the (infrequent) skipping.