Urethane is a rubber-type material that is very flexible (similar to your factory OEM bumpers) and will hold up well in the case
of an accident. Urethane is therefore popular for its durability. Urethane is considered to be an unbreakable part that can take
everyday bumps and abuses. Easy installation with illustrated instructions and all hardware is provided depending on the
manufacturer. If you are purchasing a quality part or kit, the urethane products are probably going to be slightly more
expensive.
More information:
http://www.wingswest.com/techInfoVideo.asp
Acrylinitrile Butadiene Styrene, or ABS, is a blend of chemicals which make the special RAZZI kind of plastic. There are many
different "grades" of ABS type plastic. RAZZI uses the very best grades, which are then blended together, using RAZZI's secret
formula to make AERO-FLEX. This is the very best material available for the manufacturing of Ground Effects type products.
AERO-FLEX is proprietary to RAZZI.