This silicone chess board is one of the more unusual chess boards we have carried. It is made of smooth silicone, which produces a rubber-like board that is very flexible. Due to the nature of silicone these boards may have a slight wave/bend that is always present in the board but does not impact play on the board. The boards measure 19 1/2" inches and have 2 1/4" inch squares. The board can be wiped clean with a damp cloth and spilled liquids will not penetrate it.