From the Super Mario Wiki
A Propeller Block is a type of block that appears in New Super Mario Bros. Wii. It is navy blue, with a yellow propeller, and has the same function as a Propeller Mushroom, with the exception that players can maintain the ability to use the Propeller Jump even after being hit as long as they are holding the block, and that they can not take it into pipes. To use it, the player must pick it up (shaking the Wii Remote and pressing ) and hold it (by holding down ). Then, the user must shake the Wii Remote anytime in order to fly. This block is found at least once in each world (except for World 1), usually in stages where fog is found and in places where there are things floating or in places beyond the reach of the character.
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