Here is a carbon fiber hinge, built by Russ Brown, that I got to touch. It must weigh a couple of ounces, and be at least 4 times stronger than A36 steel. Of course it makes no sense as carbon is most useful for deflection driven parts. But you can prove that you are one of the cool kids with these. These are like the chocolate chai caramel vanilla hazelnut white mocha caramel sauce classic syrup mocha cookie crumble frappuccino of coffee drinks.  These are the definition of yuppie.  What do you suppose they cost?  $100 each?  $500? I wish I had some.