Facing beam brick from Space Brick.

Color: black with white speckles, "Milky Way" on a dark joint.
The manufacturer offers a unique opportunity to create a custom brickwork pattern for any project. An accent color is applied to the base of the beam, and the ratio of speckles to the base can be chosen by the customer.

Size 600x100x45mm.

Even more options for beam bricks: https://3dsky.org/users/ingusha/models 
Manufacturer's website: https://space-brick.ru/