Quoted from the website below: The leather from Matsusaka beef contains a large amount of unsaturated fatty acids. You'll notice this when using the product, but initially, the leather surface doesn't have much luster. However, when external factors like body heat and friction are applied, the oils contained within the leather surface, causing a sheen similar to cordovan or enamel. Moreover, unlike other materials, the luster of the leather, once achieved, will never fade. This characteristic of the leather is unique to Matsusaka beef leather. ■ Material: Matsusaka Beef ■ Size: W180 x H90mm ■ Specifications: 6 card slots ■ Made in Japan Color: Pink系 (Pink-ish) Material: Genuine Leather Leather Material: Cowhide Accessories: Box Stains/Tears: None