... of thee biodegradation,thenon -toxic ecology environmetal protection material. The Wool polishing ball is one kind of thee biodegradation,thenon -toxic ecology ... ,4,5,6,7,8-inch ball of wool and rabbit hair ball polishing, and can produce 2,3,4,5,6 ... ,insulation. Polishingt:marble,crystal,glass,jedeware,furniture,stainless steel plate Wool polishing ball