Features and Benefits: 100% Air Tightiness testing According to the original factory specifications. Stable characteristics, high reliability. Precisely engineered to absorb shock and vibration from the road Easy installation. Description: Condition: Brand New Fitment Type: Direct Replacement Warranty: 1 year warranty for any manufacture defects Material: Steel, Aluminum alloy, Nylon Test more than 3,000,000 times: Durable and Safe 24 hours air tightness test ≤0.02MPa: Air Tightness Guarantee Greasable or Sealed: Sealed Placement on Vehicle: Rear, Left, Right .