Title: "Some properties of superthin and superlong gravitational flux tube solutions in 5D Kaluza-Klein theory"

The properties of the wormhole like solutions in 5D Kaluza-Klein are discussed. These solutions with electric and magnetic are filled. The properties depend on the relation between these fields. If electric field is approximately equal to magnetic field the corresponding spacetime has a central part which is like to a flux tube filled with these fields. The length of such tube depends on the relation between E and H and can be arbitrary long. The cross section can be also arbitrary small and can be choosen in the Planck region. Such gravitational flux tube is similar to a "string" attached to 2 D-branes.