There are some different types of plywood, such as film faced plywood, commercial plywood, melamine plywood, fancy plywood, grooved plywood, PVC plywood, etc. In some cases, the outer leaves are made of noble or precious woods. The reason is that these wooden panels will be used for decorative and not just structural purposes. Melamine plywood for decorative purposes is also common. http://www.xingang-wood.com/plywood/film-faced-plywood/