White nylon plastic with a matte finish and slight grainy feel.
About this Product
If you need a blank die, you can order this and write on the sides in marker, or paint it. Or do whatever with it. It's just a bevelled cube with inset sides. But this is really just a test model. It's slightly larger than most dice (2cm) and solid, which will make it pretty expensive. Also feel free to download the model and modify it for your own needs.