This specific set appears to be a "York" brand set, as indicated by the logo on the weight plates. The set typically includes:
Weight plates: Various plates, such as the 5 kg plates visible in the image, that can be added to the bars to adjust the weight.
Dumbbell bars: Shorter bars used to create dumbbells for single-hand exercises.
Barbell bars: Longer bars that can be used for two-handed exercises. The set in the image includes a straight bar and a curved "EZ curl" bar.
Spinlock collars: Nuts that secure the weight plates on the bars, preventing them from slipping off during use.
Case: A portable case to store and transport all the components.