A book with a solid cover is called hard cover. The cover consists of a silk paper coated grey cardboard (thickness of 2 mm to 2.2 mm) The silk paper is additionally matt or glossy coated for better protection and therefore appears even more high quality. 

A soft cover is a brochure or a book with a flexible cover. The cover consists of a durable SBS board, which can also be printed inside. The runs from 1 to 100 units will be digitally printed.