These 304 Stainless steel Interlock flexible exhaust joints serve to absorb excess vibrations and movement caused when custom making an exhaust system. Allowing a small Degree of movement can help when aligning or fastening exhaust flanges and V-Bands, as well as mitigating for linear movement as the exhaust system heats up and expands during use. The semi-flexible section is wrapped with an external mesh to enhance strength and durability. When added to your exhaust system, it can help reduce common problems found in other flex couplers such as rattling, rubbing or collapsing.