These artists' portfolio cases are made by hand in a traditional, bookbinding way and have a robust cover. The corners and the zigzag spine have been reinforced using book linen whereby care has been taken that the linen's cut edges are encased by the cover. Each portfolio case is secured with 3 cotton ribbons and the interior is equipped with white acid-free card and 3 flaps which hold all works of art in place. A label is included with each portfolio case.