Retro 1951 Retro 1951 pens remind us that 'life is too short to carry an ugly pen!' Retro pens write with very smooth flowing roller ball ink, you will never want to write with another pen again after you try one. Retro 51 pen refills are also available for purchase on our website. These pens are a perfect price point for gifts, and can easily fit many styles because of the wide range of colors to choose from. Each pen comes in a charming cylindrical case with 'retro' graphics adorning the case.