The set was released back at the end of June and has a base set of 88 cards - 72 player cards (6 per team), 12 "Opening Day Starting Pitcher" cards (1 for each team) and four checklist cards. It uses the same design for the player cards as the Series One and Three sets which are numbered consecutively with the other two sets (Series One was numbers 1-72, Series Two is numbers 73-144 and Series Three was numbers 145-216).
The set is pretty much your standard Calbee set (which seems to be what I say about every one of their sets). The player cards are attractive but, as Sean talks about in his post about the set, the photo selection is pretty monotonous. There's only two cards that aren't in the "pitchers pitching, batters batting, catchers catching" category - Seiya Suzuki and Sosuke Genda. There's only two cards that use a horizontal format which at least break it up a little bit. The player selection includes a number of stars - Suzuki, Yoshitomo Tsutsugoh, Tomoya Mori, Hayato Sakamoto, Sho Nakata and Munetaka Murakami - as well as a couple of 2018 draft picks - Koji Chikamoto of the Tigers, Kaito Kozono of the Carp and Taiga Kamichatani of the Baystars. Here's some example cards: