Regulation Silicone Tournament Chess Board - 2.25" Squares by US Chess Federation Manufactured out of durable silicone material, designed to ALWAYS lie flat and withstand years of abuse Measures 20" x 20" with 2.25" Squares and features the Rank/File Labels Perfect for Youth, Scholastic, and Tournament Chess Players Exceeds all US Chess Federation and FIDE Requirements for Official Tournament Use Manufactured Exclusively by the United States Chess Federation (USCF)