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.

New O-rings and air connection are included. 

Can be installed in the following vehicles: 

 

Mercedes E-Class W211 Chassis Models Include: E280, E300, E320, E350, E500, E550, E55 AMG & E63 AMG

Original spare part number:

 

A2113200725 , A2113201525 , A2113201325 , A211 320 07 25 , A211 320 15 25 , A211 320 13 25 , 2113200725 , 2113201525 , 2113201325 , 211 320 07 25 , 211 320 15 25 , A211 320 13 25 

Our advantage:
-OEM quality
-Factory price

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