14"x14" Microfiber Cleaning Cloth Professi. . Designed in few different sizes and colors, these uniquely engineered micro fiber cleaning cloths, are sure to meet your needs as well as your aesthetic tastes. Whether you're cleaning your car, your computer screen, or an old antique, our microfiber cleaning cloths are sure to make them shine. GSM or Grams per Square Meter is a unit of density of the cloth.