TWSBI Obsidian Fountain Pen
Designed for both newcomers to fountain pens and experienced writers alike, the TWSBI Obsidian Fountain Pen delivers dependable performance with a bold, modern aesthetic.
True to TWSBI’s reputation, the Obsidian features a high-quality, high-capacity piston-filling mechanism that allows for extended writing sessions without frequent refills. Its deep black “Obsidian” finish offers a sleek, understated elegance, making it a versatile choice for everyday writing or professional use. The transparent barrel subtly reveals the ink level, while the screw-on cap posts securely for balanced and comfortable writing.
Each pen is presented in a sleek clear case with a minimalist design and is further protected by an outer cardboard box, making it ideal for gifting or personal use.
A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world:
- If you write small, go with an EF
- For the normal writer, F is the most popular
- If you tend to lean on a bigger font, M will be perfect
- B is for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
- Stub nibs are italic in writing style (have a special card or invitation to write?)
PERSONALIZE YOUR PEN WITH CITYLUXE:
| For Every Pen: | Laser Precision: |
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MATERIALS WE ENGRAVE:

Lacquer Engraving

Metal Engraving

Plastic Engraving

Resin Engraving
If you're interested in learning more about the engraving process or need comprehensive details about our personalized pen engraving options, please visit our dedicated Engraving Information for Personalized Pens page.
For questions or assistance, reach out to our team. Your satisfaction is our priority.
Specification
| Brand | TWSBI |
| Product Type | Fountain Pen |
| Body Material | Resin |
| Diameter - Grip | 10.0 mm |
| Diameter - Max | 15.2 mm |
| Length - Capped | 139 mm |
| Length - Posted | 161 mm |
| Length - Uncapped | 131 mm |
| Filling Mechanism | Piston |
| Capped or Retractable | Capped - Screw On |
| Weight - Whole Pen (Empty) | 0.75 oz / 21 grams |
Nib Size Chart

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.
Ex: Shipping and return policies, size guides, and other common questions.
Use collapsible tabs for more detailed information that will help customers make a purchasing decision.
Ex: Shipping and return policies, size guides, and other common questions.
商品が開封されておらず、元のパッケージで返品され、レシートが付属している場合は、商品を受け取ってから 14 日以内に購入品を返品できます。質問はありません。商品の価値の 100% (配送料を除く) は、購入品の安全な返品のために返金されます。
不良品、商品違い、数量違いの場合は商品到着日より14日以内にご連絡ください。正しい商品を再送し、エラーによる返品送料を返金いたします。
期待に不一致が生じる場合があることは理解しています。お問い合わせいただくだけで、カスタマーサービス担当者が手順全体をご案内します。買い手がすべての配送料を負担しなければならないことに注意してください。
次のような理由で荷物が返送されてきた場合:
未請求
不完全/不十分な住所
指定の住所にお届け不能
拒否など…
小包が当社のオフィスに戻ってきた場合にのみ、製品の購入価格から配送料を差し引いた金額を返金します。これは、送料無料の注文にも適用されます。
パーソナライズされたアイテム
すべての販売は最終的なものであり、カスタマイズ/パーソナライズされたアイテムは返品できません.返金、ロイヤルティ ポイント、または交換は行われません。