Patented Chess Board - Double-Sided 20x20 Silicone Board - Tournament Regulation - Foldable, Spill Proof, Stain Resistant - for TravelDURABLE: Stain Resistant, Spill proof Silicone Board PATENTED BOARD: 20x20" Double Sided Chess Mat with Algebraic Notation, suitable for beginners and advanced players. TOURNAMENT READY: Meets all World Federation's proportions standards for tournament play. EASY TRAVEL: Foldable and easy to fit anywhere. BEST CHESS SET EVER: We stand behind our products. If you find any issues with your order please reach out to us and we will make it right.