The present invention provides a method of treatment of viral hemorrhagic fever with protein C. 1-20 MPa, and then taking out the random mat from the metal mold. The resilience coefficient Ec of the center 8, the resilience coefficient Em of the core 4, and the resilience coefficient Eb of the golf ball 2 satisfy the following formulae and :Eb\u2267Ec\u2267Em\u2003\u2003;Eb\u2212Ec\u2267Ec\u2212Em\u2003\u2003. The amplitude of the pressure waves is preferably monitored in the venous blood line.