These are custom made card wallets. They can hold several credit and business cards. There is also a pocket on each side if you need to hold anything that is a different size. They can be made with designs specified by you.
The leather used is tooling leather in the 5-6oz thickness range. This type of leather sometimes has the occasional range mark or natural blemish. It is not perfect, unmarked, smooth (and also very expensive) leather, but I prefer the character such marks add to the finished product over those anyway. Any color used is applied with acrylic paints and sealed to protect the exterior finish. The leather is dyed using various colors and products to bring out the designs.