Billfolds are flat folding cases for carrying cash, credit cards, and identification cards. Billfolds or wallets are usually made of leather or leather-like materials.
Lambskin is a type of leather created from the skin of sheep. Lambskin leather is lightweight and soft and can be both finished and unfinished. Unfinished lambskin is usually left with the wool still on one side and is mostly used in the manufacturing of winter wear such as gloves, boots and jackets. Finished lambskin has no fleece and is treated to produce a luxurious and smooth surface, often used in leather accessories, handbags and fashionable jackets.