Big Ben Oil Slick Ball Point Twist Pen

The pen should never be exposed to extremes in the environment.  Do not expose the pen to temperatures exceeding 120 deg, and colder temperatures below freezing.  Although the pens may survive these temperature extremes they will most likely warp thus degrading their performance and altering their appearance.  

Clean carefully with a soft cloth slightly dampened with water.  Recommendation is to wipe using a lint free cloth to prevent scratching the surfaces.  Although the materials have been treated to avoid environmental damage from normal use they can and in most cases will be damaged by strong cleaners.