White nylon plastic with a matte finish and slight grainy feel.
About this Product
The shape of this D18 was designed by AleaKybos. Each face has an opposite face which is parallel.
Check this applet. Set Points=18, select "PackAnti" and then click on "Make Dual" to see the underlying polyhedron. This die is the result of the intersection of this polyhedron with a sphere of the appropriate size.