Rookie Autographs were included as inserts in 2008 UD A Piece of History. 42 rookies were included in the set as autographs. The cards are skip numbered from 101-150 to permit the use of the MLPA RC logo. However, it is currently being treated more like an insert set than part of the main set by many collectors. Overall the cards were inserted 1 per 16 hobby packs. Besides the main set, Blue, Copper, Gold, Silver, and Red parallel sets also exist. All cards have sticker auto rather than on-card.