What is the typical amount of electrical power that can be extracted from a piezo bender element?

A rigid surface accompanied by a bending element bolted to it called “Double Quick Mount” gives an easy display of a cantilever mount generator. An open circuit voltage of 15V peak amidst two electrical leads is produced by supplying 80 gram force to its tip with frequency of 60 Hz. The output of the loadis 5.3 Vrms after the leads are joined to an 8 Kohm resistive load showing a power output of 3.6 mW.