The product is a 2007 SP Authentic By the Letter Rookie Signatures card featuring autograph of Glen Perkins from the Minnesota Twins. This limited edition card is numbered out of 75 and signed by the player himself. Produced by Upper Deck, the card is part of the base set for that year and is made of card stock. The autograph is authenticated by Upper Deck, making it a valuable and sought after collectible item for baseball card enthusiasts.