These dice are made from the same material as the interior of the Faux Metal dice we debuted at shows a few years back. This material is about 63% heavier than the normal plastic used by the German factory to make their dice. The advantage of these dice is that they are heavier than normal dice so they have the feel of being special but are not so heavy that they are likely to damage the surface they are being rolled upon. We liked these complementary opaque colors because they are bright, unique, and look good. These dice will brighten up any gaming session and will definitely get noticed!