They could be Magnesium, not 100% sure. I believe the chain case is made from Magnesium, therefore, would think the spacers might be Magnesium too as they appear to be the same material as the chain case.
The aluminum spacers are 16 mm OD and are 10 mm thick. I added a 2 mm thick washer to each spacer to make the distance a total of 12 mm. This allowed me to center the rotor between the parking brake pads better when adjusting the parking brake.
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