W5 Critical Task Dry Wipers, Flat Double Bag, Spunlace, 9 x 9, Unscented, White, 100/Pack, 5 Packs/CartonDesigned for ISO Class 5 or higher cleanroom environments, KIMTECH PURE W5 Critical Task Dry Wipers are made of a 50% rayon and 50% polyester spunlace. They feature a high water absorbency rate, with excellent absorption efficiency and capacity. No binders or surfactants are used in their production, resulting in low extractables. These wipers feel like cloth and are double bagged in an anti static bag.