Tweak
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In the whip tubing thread everyone is stating it's vinyl.
It appears that the DB tubing is made out of vinyl tubing, which can tolerate temperatures to about -40* C.
i believe the 7th Floor stuff is also a blend of vinyl
So, 7th floor: Vinyl. Do not freeze/ do not over heat; do not soak in ISO! Yes it is a specific vinyl wich is studied to trap as less particulates as possible while not having the usual (horrible) PVC taste.