Thank you for viewing our product! This item features Advan leather, which has an antique appearance and a unique marbled texture and color. During the tanning process, the base color is applied to the first layer, and after the color is set, a darker color is applied to the second layer. There are individual differences in how the base color appears, and as you use it, the base color will be emphasized through aging, revealing the natural depth and character of the leather, such as its inherent patina and wear.