Postcards 

Postcards make great marking tools because they can be designed for any kind of business or project. Popular uses for postcards range from sending out coupons, to-go menus, for sale notices, or event announcements. 

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While postcards can come in just about every size under the sun, if you're mailing and want to keep your postage affordable, remember that postcards can only get a discount rate if they're mailed via EDDM or
4in x 6in in size.