Blue Microfibers Glass Towels are scratch-free cleaning cloths, which are ideal for using on windows, mirrors and glass. Polyester and polyamide (nylon), polymers, are combined to form single threads, within the cloth, creating microfibers’ minute structure. Microfibers’ fine pores make them great for penetrating dirt, removing oil & grease and leaving a streak-free drying surface. Durable, can launder up to 500 times. 16”x16” Regular Duty 240 GSM.