I bought a set of technical pens for my art project.

I bought a pack of ball pens.

I bought a pack of conductive pens.

I bought a set of feather pens for calligraphy.

I bought a set of geometric pens for my art project.

The farmer built several goose-pens on his farm.

I bought a set of ruling pens for my art class.

I bought some keelyvine pens yesterday.

I bought some keelivine pens from the store.

I have a collection of dip pens.