Shock Absorber boot:

The car shock absorber is part of the vehicle's suspension system and plays an important role in making sure the vehicle is operating safely and correctly.
The shock absorber has two mounts, the upper mount and the lower mount. The upper mount of the car shock absorber is attached to the frame and the lower mount is attached to the axle. When your car hits a bump, the car shock absorber dampens the shock through a simple process. The spring's energy is transferred from the car shock absorber into the piston. Fluid is allowed to leak as the piston moves up and down. The release of fluid slows the piston down, which results in a slowing down of the spring's movement.

Most car shock absorbers rely on fluid friction as described above, but there are also several other types of shock absorbers available for vehicles. Shock absorbers have important functions related to safety including controlling rolling and swaying of the vehicle.
1.Materials advice: siliconeand rubber (EPDM, also NBR, SBR, CR, NR, etc),as your request , Environmental Friendly, to give you optimized material performance in your particular application.
2.Color: black, transparent,red, blue,any in PMS,Especially for the silicone products.
3.Hardness: 30 to 90 shore A or IRHD, tolerance can be +/-5 shore A, for some special products, we can reach +/-3 shore A tolerance.
4.Excellent chemical and physical property, high/low temperature resistance, oil and fuel, water, weathering and Ozone resistance etc.
5.Application: automotive, machinery, bathroom facilities,medical, household electrical appliances etc.