 SCP-669 is a sphere of radius 2.6 centimeters, resembling a large bearing. When inactive, SCP-669 weighs approximately 560 grams. The surface of SCP-669 contains numerous sites of corrosion and pitting, as well as remains of a cadmium blue paint. SCP-669 activates when placed within 54 centimeters of any object larger than itself, and set into motion. While active, SCP-669 appears to lack gravitational mass. Instead, it describes an orbit around the object at one of a set of distances up to 54 centimeters from the object's surface.