Co-signers were inserted in both series; series one at one in 387 hobby boxes and series two at one in 309 hobby boxes. The 12-card set features action photo of a different player on each side of the card along with an authograph of each player. Each card is stamped with the Topps Certified Autograph issue stamp. There were three groups at different levels. Group "A", or cards CO1-CO4 were inserted at one in 15,483. Group "B", or cards CO5-CO8 were inserted at one in 5,161. Group "C", or cards CO9-CO12 were inserted at one in 430 packs. Offered here is a Kobe Bryant/John Starks example, graded SGC 8.5