Combination Padlocks are available in a variety of constructions and designs, but the single most important feature of a combination padlock is whether the combination can be reset:
Resettable Combination Padlocks can be programmed to the combination the user chooses. The combination dials may be located on the bottom, side, or front of the padlock body.
Non-Resettable Combination Padlocks have a factory set combination that cannot be changed. Some models also include a key control feature. These padlocks are typical locker style padlocks with a single dial on the face.