Its made by tygon, but just having tygon tubing doesnt prevent bacterial growth. They make a silver colored tubing that actually has chemical properties that kill bacteria, my method is a lot less technical. Black tubing means no light and no light means nothing grows, simple science!
Shaolin, I fail to see what got you all worked up in this thread to begin with. And for the record, I painted the inside of my case flat black in order that it might absorb radar signals, and thus become stealth.
Just kidding O_o, I like the look of all black...