Sterile mask has a low-linting polyethylene film outer layer that provides protection from contamination. BICOSOF* fabric inner-facing provides comfort 7in pleat style with soft ties Excellent bacterial and particle filtration combined with good breathability Gamma sterilized and individually bagged Double bagged Certificate of Irradiation available Recommended for ISO Class 3 or higher cleanroom environments Color: White Size: Regular 1 case/10 bags, 1 bag/20 units, 1 case/20 units