Here is used a very durable material. 

Made in China quality CR Rubber, Bone material iis Nylon PA66
The long experience in the field of Air suspension, led to the highest quality. 
Thousands of satisfied customers confirm the superior quality of this product.
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New O-rings and air connection are included. 
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Can be installed in the following vehicles: 

 

Mercedes E-Class W211 E500 E320(2003-2010)
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Original spare part number:

 

 A2113200825 

2113200825

211 320 08 25

ASK-MB006R-AP

Our advantage:
-OEM quality
-Factory price

-Personal advice
-We have a 1 years warranty without mileage limits
-Worldwide express delivery is our standard