Ongard Sterilisation Rolls feature process indicators and are manufactured from clear, puncture-resistant, 1mm nylon. They are for use in steam (Up to 425 degress F/218 degrees C). Convenient, economical way to package instruments/items - use only length and width required. Manufactured from medical grade paper. Blue tinted transparent film easily identifies compromise in film due to puncturing or tearing. Complete paper and film separation. Triple seal.