The actual set you get may slightly vary in color from what you see on your screen due to your screen and printer settings.

Cork-Back Coaster Top layer is hardboard MDF (medium-density fibreboard) Size is 3.74"x3.74" x 0.12" (9.5 cm x 9.5 cm x 0.3mm) Rounded corners Water-repellent, heat-resistant, and non-slip Easy to clean