1/12 concrete brick or blocks

These are 1/12 scaled cargo building material blocks or bricks. The model is hollow so you can fill it with sand to make it heavier on you trailer but also save on filament. 

This model containers 2 single layers. One is to be used as top layer. I've also added a single block. Because.

This can be scaled down to 1/87 for H0 trains.