I suspect this is Polyvinylidene Fluoride Piezoelectric Film (PVDF). Not a new material -- there was a failed Kickstarter to make speakers out of this stuff 4

I suspect this is Polyvinylidene Fluoride Piezoelectric Film (PVDF). Not a new material -- there was a failed Kickstarter to make speakers out of this stuff 4 years ago: https://www.kickstarter.com/projects/richardhaberkern/speakers-thinner-than-paper-pvdf-piezo-film-techno https://www.kickstarter.com/projects/richardhaberkern/speake...