Special Design of Felt Mat - The color of grass green helps for easy sorting and contrast without any color confusion. Felt mat is made of sbr materials, which is easy to roll up. | Bigger Size - 36.6" x 24.1" mat for up to 1000 pieces puzzle. | Genius Idea of The Inflatable Tube - You can control the firmness of the tube based on how much air you add and would not bent your pieces when you use so