Allevyn Ag Non-Adhesive Hydrocellular Foam Dressings absorb wound exudate and create a moist wound environment. Silver foam dressings are ideal for venous ulcers, arterial ulcers, diabetic ulcers, pressure sores, donor sites, surgical incision and excisions, and 1st and 2nd degree burns. Allvyn Ag dressings have a foam core and a non-adherent wound contact layer. Can be left up to 7 days. Available in 4 sizes: 2" x 2" (#66020977), 4" x 4" (#66020978), 6" x 6" (#66020980), and 8" x 8" (#66020981).