White nylon plastic polished to reveal a smooth matte finish.
About this Product
There are six regular convex polytopes in 4D, which are analogous to the
five Platonic solids in 3D. This is the first, the pentachoron
or hyperpyramid, in a vertex-first projection. It has 5 tetrahedral
cells, and like the tetrahedron is its own dual.
In every dimension there's one polytope like this: all triangles, self-dual, analogous to the tetrahedron. As a group they're called simplexes, so this is the 4-simplex.