Description The Retro 51 Antique Metalsmith Rollerball pens, such as the pen Dr. Gray, are vintage and aged to perfection! The Dr. Gray model is an ode to Henry Gray, well known for his book on the human anatomy. The pen has a lacquer finish barrel, knurled twist-action cap and antiqued silver trim.Each twist-action rollerball pen comes loaded with a rollerball refill that flows with a medium stroke and can be converted to a ballpoint with the Easy Flow 9000 / Parker style refill.