Cake Board Marble Round Extra Sturdy Ø20cm The Cake Board Marble Round Extra Sturdy Ø20cm has a chic look. The board is covered with a foil with a marble print. The diameter of the cake board is approximately 20 centimetres. Thanks to this size, the cake board is ideal for serving and presenting small cakes. A cake board is useful for use in a cake box, among other things. If you use a cake box without a base, the box can become damp. A cake board prevents moisture and ensures that the box remains sturdy. You can also use this board instead of a cake plate.