Specifies the physics type on an object:
Sphere gives spherical physical dimensions.
Sphere Hat is similar to Sphere but the top is supposedly flat, making it easier to put other objects on top of it.
OBB allows you define a specific cuboid size, such as 4x9x3, but cannot be used for a moveable object (except for moving terrain type objects such as elevators). To stop the object being moveable, use the Physics→Model→Controls property.
Property Name: PhysType