Curly Black Walnut Pen Blanks. These gorgeous pen blanks have been air dried and originate from North East Pennsylvania. These black walnut pen blanks feature some curls, and chatoyancy. Colors can range from a brown, dark purple, and dark cream.Please note that the price listed is per pen blank, and you are not guaranteed to get the pen blanks in the image. Pen blank sizes may be +- 1/8″ on any side.