The result of gravitational collapse of a compact body is believed to be a singularity hidden beyond its Schwarzschild radius known as a black hole. In the interior black hole region, a remarkable change occurs in the nature of the spacetime, namely the external spatial radial and temporal coordinates exchange their characters. So, the interior black hole solution is represented by a non-static spacetime. With the assumption that the material content of the spherical body is an anisotropic fluid, we have carried out a brief study of the annular space time metric. The case of isotropic pressures is discussed as a particular case and a regular solution has been obtained.