Take a deep breath with this 5-Layer Face Cover Filters Choose from a pack of 20 and 50 Replacement filters for filter covers 5-layer activated carbon filter system Dimensions: 12.5cm x 8cm Allows heat and moisture to escape without affecting breathing Buying Options:  6.99 pounds instead of 69.99 pounds for 20 filters - save 90%  7.99 pounds instead of 79.99 pounds for 50 filters - save 90%