Some typedef enum clarification

[bare_nature]

Hello,

I'm using Scripting Bridge to interact with another application and in the .h file of that application I read the following declaration.

enum ApertureColorLabels {
	ApertureColorLabelsNoColorLabel = 'rkNL' /* No color label */,
	ApertureColorLabelsRed = 'rkRD' /* Red color label */,
	ApertureColorLabelsOrange = 'rkOR' /* Orange color label */,
	ApertureColorLabelsYellow = 'rkYL' /* Yellow color label */,
	ApertureColorLabelsGreen = 'rkGR' /* Green color label */,
	ApertureColorLabelsBlue = 'rkBL' /* Blue color label */,
	ApertureColorLabelsPurple = 'rkPU' /* Purple color label */,
	ApertureColorLabelsGray = 'rkGY' /* Gray color label */
};
typedef enum ApertureColorLabels ApertureColorLabels;

Does this mean that the constants (such as, ApertureColorLabelsRed) are integers? Or are they of type char?

In other words, can an enum only hold integer values?

Thanks!