Tubing features annealed, 304 stainless steel, while the braiding is made of multi-strand, 304 stainless steel wire. The exterior of these hoses are made of heavy duty PVC, which protects against germs and can withstand temperatures up to 350F. Coating will not hold a flame; blue color indicates braided connector. This unit also comes with a Quick-Disconnect, which is made of a brass body and carbon steel safety sleeve. It has a flat face, push-to-connect closure. This unit also has a thermal shut-off, shutting off the gas flow when internal temperatures exceed 350F.