One-piece laser welded body for maximum protection and precise operation maintaining sensor integrity. Dual internal talc seal makes Our Oxygen sensors last longer. Breathable Teflon membrane allows increased air flow for a faster switch rate to improve fuel economy and save the motorist money at the pump. Stainless steel shield protects the element from thermal shock and regulates proper air flow to ensure faster sensor response and better performance. Manufactured with the highest grade materials for prolonged life and superior performance.