Century number releases (100, 200, 300, etc.) are often marked as special occasions. 2007 saw the release of the 300th BB Senshi kit in official numbering. However, the previous kit had been BB 295. Bandai retroactively filled in the missing five kits alongside releases of kits with the 300+ numbering. These retroactive kits were of units from "Mobile Suit Gundam SEED Destiny", many being recolors of existing kits. Additionally, popular SD Gundam kits have been re-released in waves at around the same time as new kits. These re-releases are broken down by series (Musha, Knight, Command, G-Generation). The popularity of these older kits is such that many have been included in later re-release waves.