The idea behind these specialties is to keep your name in front of your customer or prospect as much as possible.
Many car dealers use printed key tags.
This is fine at first and may even get some referrals. As the car gets older and things start to go wrong, the name of the dealer who sold them this old clunker is staring at them every time they start it. Calendars are also very popular, especially with banks and insurance people. Once insurance is purchased, however, the calendar usually serves to remind the customer only of the next premium check he or she has to write. There's a better way.