7 Color Assortment of Corn Cob Pen blanks: Red, Blue, Orange Green, Gray, Purple & Clear Give the gift of a truly unusual pen made from a corn cob pen blank. Turning a corn cob blank is a fun and unique experience. The blanks are made from cobs that are dyed, stabilized and hardened. Blanks are about 5" long and will make pens up to 5/8" diameter (varies). Turns and finishes similar to stabilized woods, requires a light touch and may require filling occasional voids with CA glue.