The Bont inline carbon wedges interlock into each other. They are 1 mm thick. You can lock them together to form a wedge to tilt you blade or frame or you can reverse them to form a solid block.
The wedges can be used for inline speed skates. You can use them if you want to create an angle between your inline boot and the frame. Many elite inline speed skaters use these wedges to create a slight angle between the boot and the frame.