The player may place up to two compo items on weapons that are dropped from enemies, but only one compo item on weapons that were bought from the Shop (the other compo item slot will be replaced by a gray X that displays "NG" on the menu when rolled over). Additionally, for two compo items to be attached to a weapon, they must not be identical. When a player hovers the mouse cursor on a weapon, regardless if placed in the Inventory or equipped, the weapon menu displays two black boxes at the bottom, representing the two compo item slots of a weapon. If the weapon has a Compo item attached, it will show in one of the black boxes.