Balancing style and functionality, this card holder features a zip and a pocket on the back. Use it as an add-on to one of the products in the same style, or attached to your belt loop or key ring. Crafted from double leather that has undergone a chrome-free tanning process. Dimensions: 11 cm x 6 cmChrome-free tanning means that a hide is converted to soft and supple leather using vegetable or synthetic extracts instead of chromium sulphate. Opening in the bottom allows for charging without removing the AirPods from the case. Part of set.