Sterilization Pouch Duo-Check® Ethylene Oxide (EO) Gas / Steam 2-3/4 X 9 Inch Self Seal Paper #SCXUOM 200 Per Box Features Duo Check sterilization pouches with both internal and external indicators will maintain sterilization of instruments for up to three years Single use pouches for sterilizing reusable instruments Manufactured with medical grade paper and extra wide chevron seal to protect against instrument breaching Pink arrows will turn light brown when exposed to steam and dark brown when exposed to EO Meets ISO 11140 and 11607 standards