I am selling a kit consisting of Code3 magnetic bases and cigarette lighter plugs. Each base comes with 7 7.5pound magnets and a silicon cover and is 3.5" in diameter; the silicon cover is vacuum mount as well to add another 15pounds of pull force onto the lightbar in addition to protecting your roof from rust and scratches. You can use the vacuum mount on a fiberglass sunroof or a fiberglass tractor roof without the light moving, although I wouldn't go much over 25miles per hour with just the suction mount. Total is 50 pounds of pull strength per magnet, 200 pounds for the set of 4. You can use these for magntic mount warning lights, trailer lights, white led off road lightbars, CB and other antennas. A set of 4 Whelen 50 pound magnets sells for $80 for the raw magnets, another $30 for 4 silicon covers not vacuum mount, and $50 for the cig plug. Whelen also wants $100 for vacuum suction mounts for a bar such as responder. Each magnet has a black base, painted black on metal part, 10mm bolt with spacer (if you have a different sized bolt for your lightbar, you can drill out the center hole), and 10mm nut on the end to attach to your lightbar. I am also including a 10ft cigarette plug with 12v positive, 12v ground, and yellow wire is the pattern selection, great way to convert from a permanent mount lightbar to a magnetic one with this kit, and far cheaper than buying a new lightbar. Great kit and have great luck with these. A set of 4magnets from code3 or whelen sells for $90 plus ship and the cig plug sells for another $35, buy this kit for less. One buy it now gets you 4 magnets and a cig plug. I am offering free shipping in the USA. Thanks for checking my listing!