This is domestically produced vegetable-tanned leather, also known as pull-up leather. Pull-up leather undergoes a pull-up process, exemplified by Chromexcel. The pull-up process involves the oil moving when pinched (pulled) with a finger, causing a lighter color to appear (up). Approximately 1.7mm thick, it has a soft, supple feel and is easy to handle. It's an affordable A4 size, making it easy to manage. Why not stock up? Vegetable-tanned leather, vintage processing, oil leather, aging, stamping, carving, water forming, and molding.