I think BBM is starting to reach when it comes to box set titles. I don't know what has spurred this "Hokkaido love" movement I've seen with BBM and the Fighters lately, but I do like the set. There are 28 regular cards in the base set, and box sets (4000 yen) also include one special insert card.
The special cards can be one of three types.
There are two printed autograph cards, in gold foil (100 copies), hologram (50 copies), red (30 copies), and blue (16 copies).
And finally, there are nine die-cut inserts with 100 copies each.