: It is an Accessory (Piece) that players can equip to characters like Luffy or Zoro.
: They are often obtained through high-level crafting using the Fuse mechanic or as drops from "Powerful Enemies" (the purple-icon bosses) found throughout the world after the main story or in specific DLC challenges.
The "45" likely refers to a specific stat value or the number of slots/games required to optimize it.