'68 rules out anything newer than urethane...
Polyester or rubber I'd guess...
Ask Ernie Schlegel, apparently he threw one back in the day.
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice." Bill Cosby
"Never argue with an idiot. They bring you down to their level and beat you with experience."
Edited on 9/3/2008 2:06 PM