According to Entrepreneur.com, “Advertising specialties outdo regular advertising by up to 19 percent, according to the Promotional Products Association International. Used in direct mail, they boost response by as much as 75 percent.”

To assure a good mix between a promotional product and your company or organization, they suggest finding a Promotional Products Supplier with experience and creativity.

If you are interested in increasing your Advertising return on Investment (ROI) drop a line to sales@imprintitems.com We appreciate the opportunity to team with you, and can promptly offer a free brainstorming session. You will receive a complimentary presentation including product photos and prices that will meet your theme, budget and goal.

Entrepreneur.com mentions a football-shaped salami as a fad giveaway.
I am not sure that is the best mix for most marketing campaigns, but if you like the sausage suggestion, we would also suggest some breath mints as a tie-in advertising specialty item.