| http://www.w3.org/ns/prov#value | - said body portion being provided with a scouring surface having a flexible liquid-permeable coating, said coating having a thickness of from 2-5 mm and comprising a polyurethane, said coating including particles of a scrubbing agent, said coating being relatively more resistant to abrasion than said body portion material, said body portion including a plurality of spaced apart ridges, each of said
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