Carbon Fiber is a cutting edge reinforced polymer that we've incorporated into a pen blank. It's five times stronger than steel and much lighter. Because of its ultra lightweight strength its commonly found in cars, sophisticated sports equipment, high-performance sailing and musical instruments. These one of a kind pen blanks have the distinctive carbon fiber encapsulated in a UV resistant polyester resin. The blanks turn and finish the same as typical plastic pen blanks. Blanks are 3/4" x 3/4" x 5" with a pen tube pre-installed.