... biodegradation,thenon -toxic ecology environmetal protection material. The Wool polishing ball is one kind of thee biodegradation,thenon -toxic ecology environmetal ... 2,3,4,5,6,7,8-inch ball of wool and rabbit hair ball polishing, and can produce 2,3,4,5,6 ... ,seal,insulation,heat preservation,sound insulation; good wear ability and crisscross are wools characteristic.By overlapping makes the felt with ...