Same Day Dispatch on Engraved Pens
Worldwide Delivery with Express Option
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Specialising in innovative in-built mechanisms for quicker, easier filling
SKU
C-M7442750
TWSBI ECO Carrara with Onyx Fountain Pen
£50.00
In stock
(1) 
Gift Wrap
We offer a professional giftwrap service to complement your pen or leather journal. Simply check the giftwrap option on the product page before you add to basket (a charge of £3.25 will be added).
We use a premium silver giftwrap paper with a subtle two-tone patterned effect, and a hand tied silver ribbon. We also include a matching gift tag, which can be appended with a message of your choice. Simply add your message to the text box when you reach your basket. Items are giftwrapped individually i.e. if you order several items only the specific item requested will be wrapped.
We do not include any paperwork inside the giftwrapped item. If you select a different delivery name to your billing details, we add a gift receipt which hides all prices.
Worldwide Delivery with DHL. Express options available
See All Delivery optionsNib size guide
- Smooth steady ink flow
- Distinct line variances
- EF particularly fine
Drawing inspiration from the timeless elegance of marble, the ECO Carrara with Onyx edition pairs a striking white marbled cap with deep onyx-black accents for a bold monochrome contrast. The clear demonstrator barrel reveals both the ink supply and piston mechanism, showcasing the precision engineering that defines TWSBI. The cap’s marbled resin evokes the smooth, veined beauty of Carrara stone, finished with polished black hardware and the signature TWSBI red emblem on the finial. The stainless steel nib, plated in black, offers a dependable and consistent writing experience, balancing smooth ink flow with subtle feedback. Equipped with a high-capacity piston-fill system, the ECO Carrara with Onyx ensures fewer interruptions during long writing sessions. A screw-on cap with rubber O-ring provides a secure seal, preventing leaks and evaporation.
As with all ECO models, the pen can be fully disassembled for cleaning and maintenance (tools included), though TWSBI recommends this only for experienced users.
Key Features
- Unique Carrara marbled cap with onyx trim
- Polycarbonate construction creates scratch resistant, resilient and crystal clear finish
- Hexagonal shaped cap and piston mechanism tip
- Twist action piston fill mechanism
- Stainless steel (in Bronze) nib with intricate TWSBI logo and detailing
- Screw close cap
- Rubber O-ring prevents leakage and drying
- Gently tapered grip section
- TWSBI logo button on end cap
- TWSBI presentation box
- Lifetime manufacturer warranty
- Dimensions (Closed): L 140mm x D 15mm
- Dimensions (Posted): L 168mm x D 15mm
- Diameter taken at widest point (not including clip)
- Weight: 21g
This is why people love it
Loads of good customer reviews submitted through feefo
Written on 13-Jan-2026
TWSBI always writes! On this order, i acquired a fine nib.
Delivery Information
All orders placed before 3pm Mon-Fri are despatched the same day (except on a bank holiday), even if your order has personalisation. Orders placed after 3pm, at the weekend or on a bank holiday are despatched next working day.
We deliver worldwide with a choice of standard (tracked post) and express (DHL air) delivery for most countries. Standard delivery to European countries is €6.50 and takes approx. 2-5 working days, whilst express is €20 and takes 1-2 days. To USA we offer tracked post (6-10 days) for $6 (free on orders > $100), and an express service (2-5 days) for $12. Delivery charges and estimated times vary for rest of world countries, please see our delivery page for more information.
Returns Information
Please return any unwanted items within 21 days of purchase. Items purchased for Christmas can be returned up until Friday 23rd January. The item must still be in a re-saleable condition and returned with proof of purchase. Items that have been personalised cannot be returned unless they are faulty. Please email support@penheaven.com if you wish to return an item, and we can provide a returns label. The charge from Europe is €8 and £10 from most other major countries.
Should you receive a damaged or incorrectly dispatched item, please inform us within 7 days of receipt, so we can advise you on the return of the item. Call 0208 731 8610 or email support@penheaven.com. A returns label will be provided free of charge
TWSBI was named for the Chinese phrase “San Wen Tong” (Hall of Three Cultures). These initials were reversed (TWS) and "Bi" added (literally meaning writing instrument) to create the TWSBI name
Compatible Refills and Items
This is why people love it
Loads of good customer reviews submitted through feefo
- Written on 13-Jan-2026TWSBI always writes! On this order, i acquired a fine nib.