Flexible materials that discharge electricity when they change their shape after being subject to kinetic pressure and vibration is known as piezoelectrics, which are divided into unwieldy ceramics that generate moderate levels of energy to flexible polymers that generate very little.
Thin, flexible material generates electricity when stretched - The Economic Times
Improved performance of stretchable piezoelectric energy harvester based on stress rearrangement
Rubber-Cal Neoprene 1/8 in. x 36 in. x 96 in. Commercial Grade 45A Soft Rubber Sheet Rolls 20-104-0125-36-096 - The Home Depot
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Rubber-Cal Neoprene 1/8 in. x 36 in. x 96 in. Commercial Grade 45A Soft Rubber Sheet Rolls 20-104-0125-36-096 - The Home Depot