Signatures include: Tournament Champion Graeme McDowell , Ricky Barnes , Stewart Cink , Ben Curtis , Fred Funk , Jim Furyk, Dustin Johnson , Robert Karlsson, Rory McIlroy , Ryan Moore , Kevin Na , Ian Poulter , Henrik Stenson , Sott Verplank. Every golf signature was obtained during the practice rounds of the 2010 US Open at Pebble Beach and witnessed by a member of the Palm Beach Autographs staff. This item was hand signed by the athletes and is accompanied by a Certificate of Authenticity from Palm Beach Autographs. A tamper-evident hologram will be affixed to the item. Signed items are guaranteed to pass any third-party authentication with 100% Money Back Guarantee.