Perfect as a mailer, event handout, or storefront takeaway. Want to stay top of mind for customers and business partners? Create a customized postcard magnet and earn prime real estate on fridges, doors, and desks. They’re big enough to stand out from other magnets, and tons of plug-and-play templates help you get just the look you want. Frequently Asked Questions Q: What size are your postcard magnets? A: Our magnetic calendars are 5.47" x 4.21". Q: How heavy is one postcard magnet? Can I mail them? A: Our postcard magnets are 0.4 mm-thick. A single postcard magnet weighs 0.72 oz, which is light enough to be mailed with a standard postage stamp. Q: Are your postcard magnets water-resistant? A: Yes, our magnetic calendars are water-resistant. However, try to avoid submerging them in water. Q: Do your calendar magnets have a glossy finish? A: Our magnetic calendars have a glossy-like finish, making them great for photos and bright designs.