MITSUBISHI Uni Ball Pin
I've been using these pens for a long time. Probably since middle school. I have these weird obsessions with Japanese stationary stores. I pick up markers, pens, mechanical pencils, and somehow i always end up bringing home a pair of these pens. I mostly get the 0.3 to 0.5, they've helped me through the years. They're about 100 yen or so in Japan, so if i recall, 3 years ago, i bought about 25 or so of those for me to use at home.