This kit includes all the seals you need to rebuild your Fox DHX, VAN R, VAN RC, or Marzocchi Bomber CR rear shock. This is typically required after about 125 hours of ride time.
The service procedure for 2011-2020 Van P-S (Bomber CR) can be found here: https://www.ridefox.com/fox17/help.php?m=bike&id=1030