Each sealed box contains 16 packs of 20 cards each in a 400 card base set. >>> Each box contains ONE Rookie Exchange card, TWO Memorabilia cards, and ONE Autograph card. Parallel set: (#`d to 99). Inserts: 1969 O-Pee-Chee reprints, O-Pee-Chee buy backs, Memorabilia cards 1:8 (Throwback Jersey & Patch parallel: 1997, 1998, 1999; UD Jersey & Patch parallel; 500 Home Run Club, and Milestone), and Autograph cards 1:16 (Signature Sensations, Inkredible, Upper Deck Autographs, Season Highlights, and All-Rookie Team).