This type consists of a relatively thin-walled metal tube with corrugations hydroformed onto its wall. Annular (parallel) corrugations are separate and complete in themselves. "Reinforcing braid is added to corrugated hose to take the tensile stress of pressurization and contain the core. Without braid, the core tends to stretch out to its original tubing form, which is several times longer than when corrugated. " "The braid also protects the inner hose from abrasion and dampens vibration. Each size and type of core has a maximum pressure rating for low pressure service without braid. " "Braid is a tubular sheath of metal wires woven in basketweave fashion. It is woven onto the hose and fastened to the ends of the hose. " "It is designed to be strong enough to withstand elongation for the full pressure rating of the hose. The braid alloy is usually similar to that of the hose with which it is used, but may be different for reasons of strength, corrosion, resistance, etc. " Braid is also used with certain types of interlocked hose in order to prevent separation of the locked edges at high pressure.