Welcome, to the monarch amoungst modern bearing design.
The Crown bearings are made with the copper crown spacer, that fits directly with the centre bore hole - leading to several advantages. This design takes the pressure and weight from the skate and distributes it far better, along the axis, and pushes the bearings further inwards. This makes these bearings extremely energy efficient.
This design also lends itself to being standout performers by forming a serious barrier to dirt entering from the centre ring of the bearing, the most vulnerable part. All this tech produced with super high quality makes for a royal roll.