Placards meet D.O.T. requirements 49CFR Part 172. Placards have square corners and no holes. B-101 - Economical 1.75 lb. Polycoated tag board - exceed D.O.T.'s 30 day weather requirement. B-946 - Self-Sticking Vinyl - may be applied directly to your vehicle. B-120 - Premium Fiberglass offer over 15 years outdoor durability. Use with Brady slide-in Placard Holders.