mckesson foam dressing 4 x 4" square no border film backing 16-4739 10 per box mckesson hydrophilic foam for wounds with moderate to heavy exudate. cover with an appropriate secondary dressing depending on the amount of exudate and frequency of dressing change or with medical tape. - nonadhesive without border. film backingwhite. 10 per box. 4 x 4 inch pad.