1,suited to precision instruments. 2,Clean Precision Electronic Components. 3,Clean hard disk,magnetic head,chip,Lenses, etc. Features Weight:160gsm Polyester and nylon blended micro-denier filament woven construction Quantity:400pcs/bag(4inch),100pcs/bag(6inch),100pcs/bag(9inch) Benefits Long service life strong absorbing water Imitation Silk,no damage to surface low partical generation,low Ion ...