Bamboo with cardboard cover, black double spiral binding and 160 lined kraft paper pages.Cardboard backing and interior sheets are made from 75% recycled materials.Bamboo is a natural fiber, therefore noticeable shade variations and grain patterns may be apparent within orders of the same style and also between items combined in sets.Due to our high standards of quality control, we must advise that slight irregularities in the bamboo of this item may result in imprint imperfections but are consistent with the natural look of the product.