Pens

What pens are used for?

They are used to write various forms on smooth surfaces such as glass, wood, paper, foam,. They are used on a daily basis in many industries.

What types occur?

• permanent pens - they are indelible
• erasable pens - easily removable from the surface, used for example for blackboards
• transparent pens - they are transparent, used, for example, when marking teskst.