【実用性MAX……？】SEASARの新作シャーペン、GRAVIUMをやっと買えたので、正直にレビューしてまいります。コスパは良い。

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I Spent 2 Years Engineering the HEAVIEST Mechanical Pencil That Writes Like It's LIGHT [ENG SUB]
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I Spent 2 Years Engineering the HEAVIEST Mechanical Pencil That Writes Like It's LIGHT [ENG SUB]

[SEASAR Showdown] A thorough comparison of Aero and GRAVIUM!!
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[SEASAR Showdown] A thorough comparison of Aero and GRAVIUM!!

I Made a Better Minecraft Movie (Sorry Hollywood)
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I Made a Better Minecraft Movie (Sorry Hollywood)

Ocean Waves for Deep Sleep LIVE 🌊 Rolling Waves & Dark Screen Reduce Anxiety, Stress & Sleep Aid
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Ocean Waves for Deep Sleep LIVE 🌊 Rolling Waves & Dark Screen Reduce Anxiety, Stress & Sleep Aid

Every Famous Number, Explained: From Pi to the Unknowable
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Every Famous Number, Explained: From Pi to the Unknowable

I was able to disable the vibrations caused by the mechanical pencil with masking tape. It also i...
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I was able to disable the vibrations caused by the mechanical pencil with masking tape. It also i...

I Tried EVERY Bed Defense!
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I Tried EVERY Bed Defense!

🔴 Makkah Live | مكة مباشر | الحرم المكي مباشر | قناة القران الكريم السعودية مباشر | مكه المكرمه
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🔴 Makkah Live | مكة مباشر | الحرم المكي مباشر | قناة القران الكريم السعودية مباشر | مكه المكرمه

The ENTIRE History of ROME
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The ENTIRE History of ROME

JP Performance - Why does nobody know the Honda NSX?!
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JP Performance - Why does nobody know the Honda NSX?!

A video about Sakura's new mechanical pencil, the Intaglio, which is an extremely practical mecha...
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A video about Sakura's new mechanical pencil, the Intaglio, which is an extremely practical mecha...

[For under 5 dollars] A guide to grinding your fountain pen nib and crafting your own perfect pen.
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[For under 5 dollars] A guide to grinding your fountain pen nib and crafting your own perfect pen.

【実用性】Seasar GRAVIUMを徹底レビュー
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【実用性】Seasar GRAVIUMを徹底レビュー

Building a Functional LEGO Typewriter
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Building a Functional LEGO Typewriter

[Starry Night] I bought a rollerball pen from Visconti, a luxury Italian writing instrument brand...
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[Starry Night] I bought a rollerball pen from Visconti, a luxury Italian writing instrument brand...

I Gave ChatGPT a Body
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I Gave ChatGPT a Body

Can You Draw Every Flag in Powerpoint? (Part 1)
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Can You Draw Every Flag in Powerpoint? (Part 1)

I Built a 37g Mechanical Pencil That Still Writes Light: SEASAR GRAVIUM [CC]
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I Built a 37g Mechanical Pencil That Still Writes Light: SEASAR GRAVIUM [CC]

I Tested ALL 2026 Japanese Stationery Award Winners
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I Tested ALL 2026 Japanese Stationery Award Winners

[Lightweight at 37g?] Honest review of the SEASAR GRAVUM. With this weight, it's surprisingly lig...
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[Lightweight at 37g?] Honest review of the SEASAR GRAVUM. With this weight, it's surprisingly lig...