Cake Demoulding Knife: A cake demoulding knife is a small - sized tool used to separate cakes from cake molds. It is approximately 20 - 30 centimeters long and is usually made of plastic or stainless steel, which will not damage the molds. After the cake has been baked and cooled down, use the cake demoulding knife to gently trace a circle along the inner wall of the cake mold. Then, invert the cake mold to separate the cake from the mold.