Designed for racers that get their tires at the last minute. Can be applied to the outside of the tire the day of the race. Dramatically aids in qualifying and the first 10 laps of the main event. Expect 1-3 tenths improvement. Undetectable. Extends tire life. One can is good for 2 or 3 racing weekends. NOTE: Shipping to Continental United States Only. No P.O. Boxes. Ground Ship Only.