Propeller Mushrooms are power-ups in New Super Mario Bros. Wii  The item gives MarioLuigi, and the

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Toads (not red toad) a suit by touching the orange mushrooms with propellers on the top called Propeller Mushrooms. They are a very common item and is World 1's main item. Once the player gets it, the user will wear an aviation-suit of their color and upon shaking the Wii Remote, they can fly. To use the power up the player will have to shake the Wii Remote to cause their character to fly into the air for a short period of time. As with all power ups if the player comes into contact with any enemy the player will lose the Propeller Mushroom.