Congratulations Boston Celtics fans! After 21 long years, your team is finally back on top. Here’s your chance to pay tribute to the 2008 NBA Champions with extremely limited team-signed Official Spalding NBA Finals Game-Issued Basketball that includes signatures from Celtic Superstars’ Kevin Garnett, Paul Pierce, Ray Allen and many more. This item is licensed by the NBA and the signature is guaranteed authentic through Upper Deck Authenticated's patented five-step authentication process.