Effective:Cleaning Pens Using a diagonal cut stiff rugged nib, these are the ideal cleaners for any thermal printing device. Extend the life of your print head and improve the clarity of the image by cleaning the head on a regular basis. Easy:Simply remove the cap; swipe the pen tip across the exposed print head Safe:Cleaning Pens Using the latest environmentally friendly materials, the printer is 100% safe, non-toxic, and safe to use.