"NITROUS","WHEN RACE GAS ISN`T ENOUGH". NOS or NITROUS OXIDE is used for a power adder in race engines. Sometimes used with a plate unit, fogger,cheeter unit,giving a horsepower gain form 50 hp - 500 hp with a single unit.Slang saying.Made of durable outdoor vinyl. Can be installed on just about any surface cleaned of dirt and debre. Great for the tool box or on a window. measures 7" x 4"