The most highly sought after inserts in the 2001 Leaf Rookies and Stars set (after the Pujols autographs) are the Triple Threads inserts. These cards feature three game used jersey pieces from three different players who played together on the same team, either at the same time or at different points in the history of the franchise. Each card is serial numbered to 100 copies. The cards were inserted randomly into packs and each is serial numbered to 100 copies.