HEAD unveiled their new YouTek Graphene Speed racket, which apparently uses graphene coating on the shaft to make it stronger and lighter. HEAD says that by the graphene helps distribute the weight better and creates a stronger and better controlled racket. Novak Djokovic, the world's top ranked tennis player will start using the graphene racket soon:

Sadly we don't have any technical details about the graphene used here and who's the supplier. HEAD didn't reveal when they'll release the new racket, and at what price.