McKesson Silver Calcium Alginate Wound Dressings contain Each dressing contains, by weight, 5% Silver Sodium Hydrogen Zirconium Phosphate. A silver alginate wound dressing can be useful in providing an effective barrier to bacterial penetration. Latex Free. Helps absorb moderate to heavy amounts of wound exudate and may help control minor bleeding. Optimal gelling profile allows dressing to avoid sticking to the wound bed and helps maintain physical integrity to allow removal from the wound in one piece. May be cut to fit wound dimensions. Non-adhesive. Available in 2 sizes: 2" x 2" (# 3557) and 4" x 4.75" (# 3558).