Umm....you mean me?
If so, yes, they're polyurethane as stated. I put some in my wife's t-top GT last fall. She's got a 308, Edelbrock heads, Typhoon intake, 70mm t-body and spacer, 73mm C&L, Steeda 18 cam, Mac upper and lower control arms, blah blah, etc. Her car hooks almost as good as mine...