| http://www.w3.org/ns/prov#value | - Crosslinked rubber powder or synthetic resin powder may be blended to the core 2. [0051] General diameter of the core 2 is 10 mm or greater and 41 mm or less, still more 12 mm or greater and 40 mm or less, and particularly 15 mm or greater and 40 mm or less.
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