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A string. Possible values are:

String Description
entity The normal entity selection box. Yellow by default.
not-allowed The selection box used when specifying colliding entities. Red by default.
electricity The selection box used to specify electric poles an entity is connected to. Light blue by default.
pair Light blue by default.
copy The selection box used when doing entity copy-paste. Green by default.
train-visualization White by default.
logistics Light blue by default.
blueprint-snap-rectangle Green by default.