Integrated several different rubber materials to create a composite rubber suspension bushing. Under normal use the durability of it can last up to 5 years and for more intense use it will also last 4 years. 
For handling potholes and rough road Ruff sets the rubber hardness level at about 80¢X, comparing to OEM 50~60¢X, its not that much of differences however, it enhance the handling performance without losing riding comfort.