The pieces are easy to play with and you can run them under water if they get dirty. With a King of 3½" tall and a 1½" base, these pieces meet all tournament regulations. The set includes extra queens as well! The board measures 19½" inches and has 2¼" inch squares. To clean the board, you can run it under water or wipe with a damp cloth. Due to the nature of silicone, these boards may have a slight wave/bend that is always present in the board, but it does not impact play on the board.