PolyMem Silver Non-Adhesive Dressings. These dressings are composed of a hydrophilic, polyurethane membrane matrix & a semi-permeable, polyurethane, continuous thin film backing that is optimal for oxygen & moisture vapor permeability. Contains a safe, non-toxic cleanser, a moisturizer, and absorbing agent silver. Ideal for cutting dressings to size, taping or tapeless application. Use as a combined primary & secondary dressing or as a secondary dressing. Size: 4.25"x4.25". 15/box, 2 boxes/case.