prov:value
| - e about 30 Shore D or greater, such as about 30-70 Shore D, about 40-65 Shore D, about 40-55 Shore D, less than about 45 Shore D, less than about 40 Shore D, about 25-40 Shore D, or about 30-40 Shore D. The material hardness ratio of softer layer to harder layer can be about 0.8 or less, such as about 0.75, about 0.7, about 0.5, about 0.45, or less.
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