GAMMA WIPE 67 - 55% cellulose/45% polyester hydro entangled nonwoven - No secondary binders - Header style packaging with Package Integrity testing. All Berkshire GAMMA WIPES are irradiated and validated sterile to a Sterility Assurance Level of 10-6 in accordance with ANSI/AAMI/ISO American National Standards, and European Standards EN1174 and EN552. Certificate of Sterility with each case and available on the web by lot number 24/7.Details:Expiration Date, Radiation Dosage, Lot Information. The Lot number is ebossed on each pack, which meets cGMP requirements for traceability.