Pens are one of my favorite tools for offline marketing.
I will forever say this...
Why?
People lose pens, people steal pens (ha- in the office you know who you are! LOL!), pens have a way of finding their way around town... and also they hang around a long while.
I closed my online business 2 years ago. My mother still has a few of my old pens- from a marketing campaign I did... from 4 years ago!
I bought 2000 pens and left them at restaurants, post offices, etc.. I just gave everyone I saw a pen...
I had a coupon code on the pen, so I could track sales....
It worked. I'd see that code come in with sales long after I distributed them.
I am a HUGE fan of pens. And... they're ridiculously cost-effective.