The engine mounts on a car are the direct mechanical connection holding the engine to the chassis. Almost all engine mounts have a rubber portion that allows a small amount of flex to reduce vibrations. If the engine was just directly bolted to the chassis, you would feel every vibration from the engine.

Structure: A--Black Rubber,  solid shaft.

               B--Black Rubber with Nylon,  solid shaft.
               C--Polyurethane (PU),  solid shaft.
               D--Polyurethane (PU) with nylon,  solid shaft.
               F -Black Rubber,  hollow shaft.

Description:
1. torque coefficient
   more than 300,000 times
2. High/low temperature resistance
3. color of polyurethane
   transparent and any color are available
4. continual working time
   More than 50 hours (-20-0 centigrade)
   More than 200 hours (50-80 centigrade)
 
Features:
1.Excellent torsional stiffness 
2.High rated axial and radial load withstanding capacity
3.Natural rubber can offer maximum durability
4.Very good sound and vibration isolation characteristics

    Other kinds of rubber metal mount are available.