DIYMAG Blank Car Magnets 17x12 in 4-Pack — 25 mil Thick Printable Vehicle Door Signs, Rounded Corners

DIYMAG Blank Car Magnets are a 4-piece set of 17 x 12-inch, 25-mil thick, round-corner magnetic vehicle signs designed for easy customization, secure adhesion at speed, and repeated use without damaging paint.

These white, printable magnetic sheets come ready for inkjet or solvent printing and are reinforced to stay attached on ferrous vehicle surfaces. They’re sized to cover most door logos, convert to promotional signage, or be cut into custom shapes for temporary branding. Because the magnets are flexible and reusable, they work well for companies with rotating vehicle fleets, seasonal campaigns, or anyone who needs a removable advertising solution.

How well do these magnets hold up at highway speeds?

The magnets are made at a 25 mil thickness with reinforcement so they maintain firm contact with clean ferrous surfaces while driving. Rounded corners reduce lift, and the flexible magnetic backing conforms to slight body curves to improve adhesion.

• 25 mil thickness for stronger magnetic attraction
• Rounded corners minimize edge curl at speed
• Flexible backing conforms to slight contours for better hold
• Best performance on clean, smooth steel surfaces (not aluminum or fiberglass)

Can I print my logo or design on these car magnets?

Yes—each blank magnet uses a printable vinyl face compatible with inkjet, solvent, eco-solvent, and latex inks, as well as permanent markers. That makes them ideal for creating crisp logos, full-color branding, or one-off promotional messages before applying to vehicles.

• Printable vinyl face for bright, detailed prints
• Works with inkjet, solvent, eco-solvent, and latex inks
• Can be hand-marked with permanent inks for quick labeling
• Cut-to-shape capability for custom signage and decals

Will these magnets damage my car’s paint or surface?

The magnets are designed for repeated attachment and removal without harming paint when used correctly. For best results, apply only to clean, smooth ferrous surfaces and avoid leaving magnets in place long-term on damp or dirty finishes.

• Non-permanent application that won’t chemically bond to paint
• Remove periodically to prevent dirt trapping and moisture buildup
• Store flat and away from heat when not in use to preserve shape
• Not recommended for aluminum, plastic, or fiberglass panels

How versatile are these magnetic signs for business use?

Extremely versatile—use them to cover factory logos, run temporary campaigns, identify company vehicles, or protect painted surfaces during short-term rentals. Their blank white surface and cut-friendly material let you create exactly the size and shape you need.

• Ideal for mobile advertising, temporary branding, and logo covering
• Reusable across multiple vehicles for rotating fleets
• Cut to custom shapes for creative signage or protective overlays
• Pack of four allows consistent branding on both sides of a vehicle or multiple cars

Who is this for: DIYMAG Blank Car Magnets suit small businesses, contractors, delivery services, event teams, and solo operators who need removable, printable vehicle signage without committing to permanent wraps. They’re also useful for marketing agencies creating temporary campaigns, rental fleets that must preserve original paint, and anyone who wants a quick, professional-looking way to display a logo or message on steel-bodied vehicles.