Tennis star Novak Djokovic recently partnered with Montblanc to develop a special edition StarWalker writing set.

The world No. 1 ranked player lent his name to the luxury writing instrument’s new collection for a special cause: proceeds from sales will go directly to the Novak Djokovic Foundation, which supports education initiatives for children in disadvantaged communities.

The new writing set, which is limited to just 300 examples, includes a StarWalker Metal Fineliner and Notebook #146 Indigo Blue. Djokovic’s signature is features prominently on the pen’s cap and the front of the notebook.

Considering Djokovic’s passion for education and his habit of keeping a personal journal, the collaboration between the player and the accessory marquee seems very fitting.

Interested customers can purchase the limited-edition StarWalker set for $740.