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Key Blanks For Your Truck Your one stop shop for all truck key blanks. Select the car's manufacturer in the left column to see all key blank options. They look like normal keys made of metal, but they have a top made of plastic that houses a transponder. Truck drivers love them. They lower the risk of theft by reducing the chance of accidental duplication. Transponder Keys A transponder key, also referred to as a chip key is fitted with a microchip that transmits a unique code signal when it is inserted into the ignition. The computer system in the