This is a semi-custom-made Helz Organ zipper book case, expanded to a size that can hold B4 notebooks. The size is 27.5 x 20 x 2.5cm (measured on the folded leather part; it's 0.5cm larger when measured at the zipper). The leather is 3mm thick and made very sturdy. Inside, there is a pen holder, a business card holder, and a memo holder, each in one place. There is no deterioration of the leather or discoloration due to oxidation of the zipper, so I think you can use it with confidence. It was made in amber, but I no longer use notebooks due to the purchase of a notepad, so I am selling it in new, unused condition. Note: The color of the photos taken is slightly lighter than the actual product. If you are concerned, please check the Helz website.