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Pads or sheets of flexible materials such as elastomers, rubber, cork, dense foam and laminate materials.
[[File:Foam1.png|thumb|Packaging material foam. Image reproduced from [https://pixabay.com/en/packaging-material-foam-grey-wavy-833665/ here]]]
* '''Natural Frequency range:''' 3 – 40 Hz
* '''Pros:'''