Lab grade, medical grade pure silicone with maximum transparency, tear resistance, and yield strength. Usable under a variety of temperatures from cryogenic to autoclave for sterilization, from body fluid transfer, to boiling liquids and lab work. Available in various sizes with maximum spool lengths up to 300 meters (~1000 feet). Multiple quantity of 100-foot orders will ship on larger rolls, uncut. Made in U.S.A.