This Tea Light holder is designed to hold a standard 4cm diameter (or smaller) tea lights. The diameter of the tea light is about 9cm wide and 6cm high assembled A porcelain material is probably the best choice for the purpose it's designed for however, other materials are available.
It comes in two pieces: The saucer (as seen on the left) and the lid (on the right)
You can see it assembled here: http://www.designprototype.net/blog/files/category-3d-prints.html