| http://www.w3.org/ns/prov#value | - made of a stretchable material as for example natural or synthetic leather, velveteen, skin, nylon, lycra, jersey or the like, said cover being of discoidal form which diameter is larger than that of an underplate, the periphery thereof including a fastening element, preferably made of a material with elastic memory, as for example elastic, an elastomeric band or the like.
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