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The known rubbers for the shock absorber but now made from a much superior material that will not disintegrate from the heat and oil of the engine.
The rubbers are not casted but ground to size from a solid bar.
Practically you will never have to worry again for the performance of your shock absorber.
The material is called fibroflex and is an elastomer based on polyurethane.
You can find information's about it here: