This is a hand-stitched, genuine leather M6 size system planner. The approximate size is 15cm (height) x 13cm (width) x 3cm (thickness). The ring diameter is 15mm. The interior features two free pockets, a ring guard, a pen holder, and a ticket holder. The free pockets can accommodate TNP size or A7 size notebooks. A jumper-hook closure flap has been added to close the planner. The exterior is made of black Milano leather, and the interior uses offcuts of natural cordovan. The Milano leather on the exterior is smooth, vegetable-tanned leather. It will develop a luster as it ages. The cordovan offcuts on the interior are vegetable-tanned leather from the horse's rear, with the grain side still attached, taken from the process of harvesting cordovan. It will turn to an amber color as it ages. Both are high-quality leathers, so please take care of them occasionally and enjoy the aging process as you use them for a long time. *Please note that it will take some time to replace the rings. Thank you for your understanding.