Troy Polamalu Signed 2011 Panini Threads Trading Card Beckett Slab 35026 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is a 2011 Panini Threads trading card that was personally autographed by Troy Polamalu. This has been professionally slabbed by Beckett Authentication Services (BAS) and includes a certificate of authenticity from Denver Autographs.