Telfa™ AMD antimicrobial sponges are impregnated with PHMB (Polyhexamethylene Biguanide), a powerful yet safe antiseptic that has a broad range effectiveness against gram positive and gram negative microorganisms including some multi-drug resistant strains such as MRSA. In addition to its antimicrobial capabilities, the Telfa™ AMD antimicrobial sponge non-adherent dressing has a perforated mylar film with an absorbent core ideal for use as a primary dressing for lightly draining wounds. 4" x 14" (10.16 cm x 35.6 cm).