He is drawing a picture with a magic marker.

He is a master of pen spinning.

He has developed a writer's callus on his hand because he writes for long hours every day.

I bought a new tailor's chalk pen.

I draw my eyebrows using an eyebrow pencil.

We will use pentane in this chemistry experiment.

My new fountain pen is easy to write with.

I lost my mechanical pencil, so I'm going to buy a new one.

My new pen tablet is very easy to use.

Propene plays an important role in organic chemistry.