Superior Quality Teflon Tape: Thread sealant tape is made of Teflon, is suitable for most kinds of soft water pipes, creating airtight seals between threaded pipes and fittings, the good density is 4 times heavier than standard tapes; Teflon tapes will not harden or crack anytime; They have the good characteristics of corrosion resistance, anti-aging, helps prevent leaks on pipes and plumbing.