If writing doesn't feel like writing without your Splendid Fountain Pens, we can't blame you! Those beautifully functioning pens are easy to fall in love with. That's why having fountain opens refill cartridges on hand is essential/ This set of Splendid Fountain Pen Refills include 6 cartridges in all; three black and three blue ink. *Fountain Pen Refill Ink Only- No pen * 6 cartridges included * Designed to be used ONLY with Splendid Duo Fountain Pens * Click cartridge into place * Suitable for ages 12 and up.