So typically this set contains cards for all the players who announced their retirement the previous year. For the first few years some players would have multiple cards in the set but that's pretty much stopped in the last few sets. This year's edition has 36 cards each showing one player. The big names who retired at the end of last season are all included - Hiroki Kuroda, Daisuke Miura, Saburo (Ohmura), Hitoshi Tamura, Masaru Takeda and Hitoshi Tamura - along with lesser names like Shinji Iwata. Players who were not active in 2016 but did not announce their retirement until mid-season (like Hideki Okajima) are included as are players who were playing overseas in 2016 before they retired (Hitoshi Fujie). Many of the pictures are from the player's retirement ceremonies although some are from their playing days. Some of the photos of the players in action could be from a few years back - for example Hideki Okajima is shown in his Yomiuri Giants uniform which he hasn't worn since 2005.
Anyway there's not a whole lot else to say about this year's set - it's pretty much similar to the other six before it. The only thing I thought a bit odd was that the set did not include a card of Nobuhiko Matsunaka who had announced his retirement last February. Here's some example cards: