A nice functional 18-sided die in the form of a hollow regular dipyramid. Looks good and rolls well, with an appealing motion unique to this kind of shape. Numbers are clear and easy to read. Just the thing to round out your dice collection! Reproduces extremely well in alumide, sandstone, and the strong & flexible materials, and would be a real showpiece in silver or steel. This is the "regular" sized model, which goes well with the most common sizes of standard polyhedral gaming dice.