Three separate heat sealed rails secure edges from separation or tearing by instruments. Seals are heated and cooled three times for ultimate strength. Secure Seal - Extra wide chevron seal protects against instrument breaching. Medical Grade Paper - Wet strength treated, virgin medical grade paper that meets or exceeds medical pouch standards. Blue Tinted Transparent Film - Facilitates both easy instrument viewing and identification of punctures or tears in film. Wide Self-Seal Adhesive Strip - Easily and securely seals pouch, providing reliable seal until pouch is opened. Perforated Fold - Facilitates easy, accurate folding of adhesive strip to form airtight seal until pouch is opened. Complete Paper-Film Separation - Consistently clean separation of paper and film is due to high grade materials and adhesives. Thumb Notch - Assures easy opening of pouch. Six Corner Tack Seals - Prevents corners from curling after sterilization. Tacks resist collection of dust and contaminants near seal. Process Indicator Arrows - Arrows change color with sterilization heat, are easily visible, and are compatible with steam and EtO sterilization agents.