curve for a deflection expansion the shape of the respective hysteresis curve of a deflection cycle instead depends on the largest previous deflection as shown in fig1 dashed lines for the first expansion phantom lines for the second expansion and solid lines for the third expansion then the increase of the new hysteresis curve substantially coincides with the return path of the hysteresis curve of this previous deflection therefore if a certain expansion behavior of the tpu film in the bladder is to be achieved it is advantageous to expand the film prior to assembly up to that value where the resulting hysteresis curve and thus the tpu film 39 s expansion behavior shows the desired shape as a result the tpu film used in the bladder avoids sagging after a strong deformation or a large acceleration of the ball a modified embodiment of the bladder 1 of fig1 is shown in fig5 one or more mounting cables 310 or the like are integrated into the reinforcement surfaces 10 which are capable of receiving significant tensile strengths and are directly or indirectly coupled at their one end to the electronic component 30 and at their other end to the bladder 1 or a carcass 300 of the ball surrounding the bladder.