Installs in seconds! Place your CABBIE on top of any vehicle rooftop and plug the sign into any standard lighter adapter. SoftShoeneo-magnet covers are made of premium grade rubber-soft vinyl that is designed to fit exclusively on a 3-inch diameter neodymium magnet. In addition to being safe for a vehicle's finish the neo-magnets are lighter and nearly twice as powerful as standard RB-80 powder coated magnets still in use today. HERE'S THE PROOF: Car Topper 1 / OTHER Neodymium Magnet with SoftShoe Cover Pull Strength: 20 lbs. with SoftShoe Cover VS. Single RB-80 "Rubber" Coated Magnet. Pull Strength: 13 lbs. with no cover Strength test results of the RB-80 Powder Coated Magnet and Neodymium Magnet with SoftShoe Cover were conducted using a rooftop section of a 1993 Toyota Tercel. The above test results were conducted by one of the nation's leading companies of magnet fabrication and distribution since 1950. Advantages of using SoftShoe Neodymium Magnets vs. using RB-80 "Rubber" Coated magnets: SoftShoe covered neo- magnets will not mark your car. Powder coated magnets tend to leave black streaks. SoftShoe magnet covers are extremely durable made from a surgical grade rubber,. SoftShoe magnet covers generate a slip-resistant surface rain or shine. This you can't get from powder coated magnets In most cases, SoftShoe covers last 2-3 years.Replacement SoftShoe covers are available for 75 cents each. Recommended Speed for Use: POSTED SPEED LIMIT (not for use in strong wind conditions) NOTE: magnetic mount not for use on aluminum topped vehiclesie. Saturn or vinyl rooftops.