A Limited-Edition Titanium Fountain Pen for Collectors
Precision-machined from Grade 5 titanium. Backed by 83 Kickstarter supporters.
Limited to the original production run. Once sold out, it will not be made again.
★★★★★
"The craftsmanship is outstanding. From the presentation box to the finish of the pen itself, everything feels premium. It's clear that a huge amount of care has gone into every detail."
— Jeffrey, UK • June 2026
ION Mathematics is a precision-engineered fountain pen celebrating the equations and mathematical relationships used to describe pattern, quantity, space and change.
The design brings together a curated collection of mathematical equations drawn from geometry, algebra, trigonometry, calculus and statistics. From the Pythagorean theorem and equations defining the area and volume of geometric forms to differentiation, averages and trigonometric relationships, each represents part of the mathematical language used to understand and describe the world around us.
Engraved across the surface of the pen, these equations transform abstract mathematical ideas into a permanent, tactile object designed to be carried and used every day.
Precision-machined from Grade 5 aerospace titanium or anodised aluminium, every ION Mathematics is individually machined, engraved and assembled in small batches. The result is a functional writing instrument that combines engineered precision with an appreciation for the elegance, logic and universality of mathematics.
Compatible with standard international ink cartridges and converters, ION Mathematics is designed for daily use while remaining a highly collectable object for mathematicians, engineers, scientists, educators and those fascinated by the patterns and principles that shape our understanding of the world.
Each pen is supplied with a paper authentication certificate as standard. Aluminium and Grade 5 titanium authentication certificates are available separately through the Authentication Works page.
All Compact pens are supplied with a double-threaded barrel as standard. If you would like a double thread on any other size, please contact us using the form, quoting your order number.
Supplied without a logo as standard. Optional end cap engraving may be requested after purchase.
Limited. Engineered. Intentional.
Authentication plate upgrades available in precision-engraved aluminium or titanium.
ION Mathematics is a precision-engineered fountain pen celebrating the equations and mathematical relationships used to describe pattern, quantity, space and change.
The design brings together a curated collection of mathematical equations drawn from geometry, algebra, trigonometry, calculus and statistics. From the Pythagorean theorem and equations defining the area and volume of geometric forms to differentiation, averages and trigonometric relationships, each represents part of the mathematical language used to understand and describe the world around us.
Engraved across the surface of the pen, these equations transform abstract mathematical ideas into a permanent, tactile object designed to be carried and used every day.
Precision-machined from Grade 5 aerospace titanium or anodised aluminium, every ION Mathematics is individually machined, engraved and assembled in small batches. The result is a functional writing instrument that combines engineered precision with an appreciation for the elegance, logic and universality of mathematics.
Compatible with standard international ink cartridges and converters, ION Mathematics is designed for daily use while remaining a highly collectable object for mathematicians, engineers, scientists, educators and those fascinated by the patterns and principles that shape our understanding of the world.
Each pen is supplied with a paper authentication certificate as standard. Aluminium and Grade 5 titanium authentication certificates are available separately through the Authentication Works page.
All Compact pens are supplied with a double-threaded barrel as standard. If you would like a double thread on any other size, please contact us using the form, quoting your order number.
Supplied without a logo as standard. Optional end cap engraving may be requested after purchase.
Limited. Engineered. Intentional.
Authentication plate upgrades available in precision-engraved aluminium or titanium.
★★★★★
"The balance is excellent, the nib writes beautifully, and the engraving is exceptionally crisp.
— Richard, USA • May 2026
Originally funded by collectors. Now available in limited quantities.
Crafted from Aerospace-Grade Titanium
Every ION MATHEMATICS pen is crafted with exacting attention to detail. From its smooth-flowing nib to the perfectly balanced body, this pen is built for collectors, writers, and anyone who appreciates the artistry of fine writing instruments.
Precision-machined nib for effortless writing
Luxurious, hand-finished materials
Balanced weight for comfort during long writing sessions
Available in Compact, Regular and XL sizes
★★★★★
"I have recently purchased both an aluminium Collector's Edition and a titanium ION fountain pen. The quality, appearance and writing experience are superb and better than many of the much more expensive ones in my extensive collection. It is great to see a British manufacturer (who are few and far between) producing pens of this quality. These will not be the last pens I purchase from Charles Lethaby."
— David, UK • March 2026
LIMITED STOCK - DON’T MISS OUT!
The ION MATHEMATICS Fountain Pen was a Kickstarter success and is now available for a limited time. Once these pens are gone, they won’t be produced again.