It appears to be made of a white synthetic material.

The male followed with a long scrap of white material he had found somewhere.

Filling the bottom was a sheet of flat, white material that looked very much like ice.

The ceiling, walls and floor were the same hard, gleaming white material.

It is a white material that looks somewhat like porcelain.

Decades or centuries of use had stained the hard white material.

There were still scraps of white material in his hands.

As she did so, a square of white material fell on to the floor.

Both were made of the same white material, like ice, but more cloudy and less shining.

They were of a light blue and white striped material.