TWSBI ECO Fountain Pen – Plum w/ Onyx
The TWSBI ECO Fountain Pen – Plum w/ Onyx combines elegance and functionality with its clear acrylic body and deep plum accents. Featuring black onyx trim and a matching black stainless steel nib, this pen delivers a sophisticated yet modern aesthetic.
The ECO’s piston-filling system provides a generous ink capacity, while its transparent body allows you to monitor ink levels effortlessly. Designed for both beginners and seasoned writers, it offers smooth ink flow and exceptional comfort during extended writing sessions.
Each pen comes with a wrench and silicone grease for long-term maintenance, reflecting TWSBI’s commitment to craftsmanship and user experience. Whether you’re journaling, note-taking, or sketching, the ECO Plum w/ Onyx is a reliable and stylish writing companion.
Note: This pen only uses bottled ink, which is not included with this pen.
Key Features
- Versatile Nib Sizes: Available in Extra Fine, Fine, Medium, Broad, and Stub 1.1 to match your writing style.
- Signature Piston Filling Mechanism: Easily refill with bottled inks while keeping track of ink levels through the clear demonstrator barrel.
- Plum & Onyx Design: Transparent resin body paired with a plum-toned cap and black trim for a sleek, modern look.
- Enhanced Comfort & Grip: Ergonomically shaped resin grip ensures stable handling for long writing sessions.
- Durable Stainless Steel Nib: Provides smooth, consistent ink flow for a satisfying writing experience.
- Complete Disassembly: Fully detachable parts allow easy cleaning and maintenance—ideal for fountain pen enthusiasts.
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 | 9.1 mm |
| Diameter - Body | 12.8 mm |
| Length - Capped | 138.8 mm |
| Length - Posted | 167.5 mm |
| Length - Uncapped | 131.6 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.
제품을 개봉하지 않고 원래 포장 상태로 반품하고 반품이나 환불이 불가능한 판매 품목 및 개인 맞춤 품목에 대한 예외가 포함된 영수증과 함께 제공되는 경우 품목 수령 후 14일 이내에 구매를 반품할 수 있습니다. 질문이 없습니다. 구매하신 상품의 안전한 반품을 위해 상품금액의 100%(배송비 제외)를 환불해 드립니다.
불량품, 오품 또는 잘못된 수량을 받으신 경우, 수령일로부터 14일 이내에 당사에 연락해 주십시오 . 우리는 당신에게 정확한 항목을 다시 보내고 우리의 오류로 인한 반품 배송비를 환불합니다.
때때로 기대치와 일치하지 않을 수 있음을 이해합니다. 저희에게 연락 하시면 저희 고객 서비스 직원이 전체 절차를 안내해 드릴 것입니다. 구매자가 모든 배송 비용을 부담해야 한다는 점에 유의하십시오.
다음과 같은 이유로 인해 귀하의 소포가 당사에 반환되는 경우:
미청구
불완전/불충분한 주소
주소가 지정된 대로 전달할 수 없음
거절 등…
소포가 사무실로 다시 도착한 경우에만 제품 구매 가격에서 배송비를 뺀 금액을 환불해 드리며, 무료 배송 주문에도 적용됩니다.
개인화 아이템
모든 판매는 최종이며 사용자 정의/맞춤형 항목은 반품할 수 없습니다. 환불, 로열티 포인트 또는 교환은 제공되지 않습니다.