Green Day and Linkin Park are handing over signed guitars to raise money for a U.S. housing charity.
Green Day rockers Billie Joe Armstrong, Mike Dirnt and Tre Cool have autographed a black and cherry electric guitar while Linkin Park have donated a signed Epiphone axe to the Charity Buzz auction.
Both bands have pledged proceeds from the sale of the instruments to Habitat for Humanity, a non-profit organisation which builds new housing facilities and upgrades local shelters for the needy.