What material are these coasters made of? Is it an absorbent stone?

I bought this as a gift for my daughter. I did not know what material the coasters are made of but my daughter loves them. She said the quality is very good and the design is very pretty.

Why you'll love it

Keep your tables protected from condensation while proudly displaying your love for the red, white and blue with this set of four American Flag coasters. They’re a great way to add patriotic charm to Fourth of July or everyday décor.SKU 3827359

Specifications

What's in the box

Care & Usage

Sur La Table American Flag Coasters, Set of 4

$25.00

Sugg.$25.00