This is a hand-stitched, genuine leather M6 size system planner. The approximate size is 14.5cm (height) x 12cm (width) x 4cm (thickness). The ring diameter is 20mm. The interior features a ring guard, pen holder, and ticket holder. The exterior is made of thick, natural-colored vegetable-tanned leather, and the interior is made of natural-colored Tochigi leather. Both are high-quality leathers, so I hope you will enjoy using them for a long time while taking care of them. The leather may feel a bit stiff at first, but it will soften and become easier to use as you break it in with care. Since it may tend to open at first, I've included a closure band. Because it's natural-colored leather, I think it will age nicely as you care for it. Therefore, I will ship it without any treatments, so please enjoy the aging process with leather oil, leather cream, sun tanning, etc. I hope it develops a beautiful amber color. ※This item is also listed on other sites. Please note that we may cancel your order if it sells out quickly on another site.