Metallica's James Hetfield and Kirk Hammett performed the national anthem before the Stanley Cup Finals Game 4 between the San Jose Sharks and Pittsburgh Penguins at the SAP Center in San Jose.
James and Kirk longtime Shark fans then signed the guitars and donated them to the Sharks Foundation to be put up for auction.
Metallica lovers can bid on them until June 15th with the proceeds going to Little Kids Rock and the Ronald McDonald House.