D4: A truncated tetrahedron. This has the advantage over regular tetrahedral dice that the numbers face up! D8: Constructed from a truncated octahedron. This rolls much better than a regular octahedron and also tessellates to fill space. D12: Normally constructed from a regular dodecahedron, but here for your mathematical pleasure we have the rhombic dodecahedron. D24: Each face of this icositetrahedron is a kite. D60: The world's first mass-produced d60 - or hexecontahedron - dice. Read more about them on Maths Gear: http://mathsgear.co.uk/collections/dice/products/unique-polyhedral-dice