The character studio marker (CSM) file format supports a prop bone in either or both hands. There are six additional markers for the top, bottom, and middle of the two props. If these tracks are detected, character studio creates a 3ds Max dummy object.

The length of the prop is the average distance between the top and bottom prop marker during animation. The prop will be oriented in the plane of the three prop markers, and its origin will be at the bottom prop marker.