しーさーが作る実用性MAXシャーペンがついに完成... デザイン、初公開。【SEASAR GRAVIUM】

After two years of development, SEASAR's second mechanical pencil is finally here — this is the design reveal of GRAVIUM, a 37-gram pencil engineered to write with surprising lightness by placing a 13g brass weight at the grip's center point using the physics of moment of inertia. The 12-sided aluminum body is coated in Neo Rubasan soft-touch finish for an exceptional tactile experience, and the removable clip lets you switch between carry mode and distraction-free writing mode in seconds. This video covers the full design story, the science behind the weight placement, pricing at $44, and the July 2 launch — with a detailed hands-on review coming in next week's follow-up video. ■ SEASAR GRAVIUM — Ultimate Mechanical Pencil ⚫︎ Buy here (On sale July 2, 18:00 JST) 　https://seasar-official.shop/products... ⚫︎ Initial Order Quantity 28,000 units ordered in total. 3,500 units completed each month, with stock replenished monthly. ⚫︎ SEASAR Official Online Store Launch July 2, 2025 (Wed) 18:00 JST Approx. 3,000 units available for the first release. ⚫︎ Hands Nagoya Store — SEASAR Product Sales July 12, 2025 (Sat) — Sales begin at store opening Duct, OctFold, Pen Tray, and GRAVIUM available. Items may sell out depending on stock. Aero won't be available until autumn but is on display for testing. ■ SEASAR Official LINE 　https://liff.line.me/1645278921-kWRPP... ■ SEASAR Official Instagram 　  / seasar_official   ---------------------------------------------------- 📄 Chapters ---------------------------------------------------- 0:00 Opening Greeting 0:31 Why I Created This Pencil 2:00 Name Reveal 2:24 Unboxing & Design Reveal 3:58 It Weighs 37g — Very Heavy 4:22 Neo Rubasan Soft-Touch Coating 5:55 Heavy Yet Light to Write 8:53 Removable Clip 11:05 Price Announcement 12:15 Launch Date & Hands Nagoya Store ---------------------------------------------------- 🖋️ SEASAR — Our Original Brand ---------------------------------------------------- Original mechanical pencils, pen cases, and more. A brand led by Seasar with uncompromising attention to detail. ・Official Store: https://seasar-official.shop ・Official LINE: https://liff.line.me/1645278921-kWRPP... ・Official Instagram:   / seasar_official   ・Official YouTube:    / @seasar-official   ---------------------------------------------------- 📍 Seasar's SNS ---------------------------------------------------- ・Sub Channel:    / @seasartalk   ・Instagram:   / seasar04   ・X:   / seasar04   ・TikTok:   / seasar04   ---------------------------------------------------- 📕 Seasar's Books ---------------------------------------------------- "Seasar's Wooden Pen Encyclopedia" 　・Ruler Edition: https://amzn.to/3F233Se 　・Standard Edition (eBook available): https://amzn.to/3tlJBgR 　・Explainer Video:    • 【木軸コレクション】実はしーさー、書籍化されました。付録、豪華過ぎます。【しーさーの...   "Seasar's Ballpoint Pen Dictionary" 　・Buy: https://amzn.to/3QK1Owz 　・Explainer Video:    • 【これで全部分かる】世界中のあらゆる73本のボールペンを片っ端から紹介... 【しー...   "Seasar's Amazing Pen Guide" 　・Buy: https://amzn.to/3weJWhp 　・Explainer Video:    • 皆さんにお知らせがあります。   ---------------------------------------------------- 🧳 Seasar-Supervised Collaborations ---------------------------------------------------- ■ nomadic Two-Tier Pen Case (PF-05N) 　・Buy: https://nomadic.official.ec/items/780... 　・Explainer Video:    • 【最強に実用的】ノーマディックの2階建てペンケースを最強進化させました。 【PF-05N】   ■ nomadic Three-Tier Pen Case (PF-05L) 　・Buy: https://nomadic.official.ec/items/780... 　・Explainer Video:    • 【3階建てペンケース】大切なペンを大量に守れる… ロマンを詰め込みまくった3階建てペ...   ■ nomadic Collaboration Backpack 　・Coil Zipper: https://nomadic.official.ec/items/701... 　・Waterproof Zipper: https://nomadic.official.ec/items/701... 　・Explainer Video:    • 【改良版】最強の多機能リュックがアップデートしました【しーさー×ノーマディック コラ...   ---------------------------------------------------- 📷 Equipment ---------------------------------------------------- ・Main Camera: SONY α7S III ・Sub Camera: FUJIFILM X-H2S ・PC: MacBook Pro (16 inch / M1 Max / 64GB RAM / 4TB SSD) ・Editing Software: Final Cut Pro ・Voice Mic: SHURE SM7B ・Writing Sound Mic: SENNHEISER MKE 600 *Amazon URLs are affiliate links.