The diameter of micro-fiber is only l/10 0f silk 0.4um,the cross section is special and it can clean the little dust, blot and oil even it is only several microns,keep your lens at good vision.The rate of Polyester 80:20 makes the materials very soft and no harm to the surface of goods even in the exact fields,for example:in the productions of coating-lens and integrate circuit etc.The special weave structure of the cloth makes the cleaning area rate to be 220 squares,absolve the dust easily and mass.You can clean the golds gently.its features:micro fiber,dye quickly and excellent capillary's effect.It won't be broken easily because of the high flexibility.The fiber couldn't be peel off and no contamination in the area after cleaning