| think...They will crack with an impact, but not the kind of impact that a shopping cart would make. I use a fiberglass that is a little more flexible than the common ones used for most of the aftermarket bumpers...If you break the bumper, you can fix it pretty easily...If you break a urethane bumper, you have to buy a new one. Each material has its pros and cons...I think urethane has better pros than fiberglass, but it's too expensive and hard to work with that, so it's out of my hands for the moment.

 ......... VIDEO OF MY BLUE Z (Right click and Save As...)
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