* On the inside of the bass drum. Look for a round, white sticker with a black serial number. The serial number will start with the letters "PE" followed by a series of numbers.
* Stamped into the bottom of one of the bass drum claws. The serial number will again be preceded by the letters "PE.".
* On a metal plate attached to the back of one of the tom drums. The serial number will be preceded by the letters "PT.".
* On the inside of the tom drum shell. The serial number will be stamped into the wood and may be difficult to see. Look for a small, round indentation in the wood that contains the serial number.