The molded brush comprises {HEAD ~ a moldable polymeric material} substantially free of {TAIL ~ abrasive particles} 
substantially free of
The molded brush comprises { HEAD ~ a moldable polymeric material } substantially free of { TAIL ~ abrasive particles }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL