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Featuring innovative eyedropper filling systems

The Opus 88 Koloro fountain Pen blends style with functionality in a medium-sized pen that stands out. Featuring a rich teal translucent barrel with subtle swirls, showcasing the ink inside in a captivating way. Its polished ebonite cap adds a striking contrast, with a smooth, matte finish that elevates the pen's modern, yet classic, aesthetic. This pen uses a Japanese-style eyedropper filling system, where you manually fill the barrel with the included eyedropper or syringe. A built-in valve lets you control ink flow and prevent leaks, so you can carry it with confidence. Simply twist open the valve for longer writing sessions and close it again when done. It's the perfect choice for fountain pen lovers who appreciate unique design and practical innovation.
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.
UK: We use a Royal Mail tracked service. Standard delivery is free over £30 (£2.50 charge for orders under £30) and takes 2 to 5 working days, Premium is £3.50 and takes 1 to 2 working days. Next working day is £6.95 and is delivered by 4pm (requires a signature).
International: We deliver worldwide with a standard and express service. Please visit our international website
Please return any unwanted items within 21 days of purchase to be eligible for an exchange/refund. 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.
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 info@penheaven.co.uk. If a faulty or incorrect item is returned, we will refund your postage up to the cost of 1st class recorded Royal Mail. If you are sending items from abroad, please call us for a delivery quote
Founded in 1988 by Michael Hsu, Opus 88 crafts precision fountain pens that blend form and function
Featuring innovative eyedropper filling systems