Unusual D8 (not twisted)

This eight-sided die has only four outward facing faces.
If it lands with a hole up, you can look throuh the hole to read the number off the backside of a face.
Alternatively, you can subtract the outside number of the bottom face from 9, as for resons of balancing, the pips on each face add up to nine.

The die is fairly balanced because its convex hull has sufficient symmetry and I have calculated the center of mass to be less than 22 micrometers away from the geometric center.

Don't forget to check out the twisted versions of this die concept!