It's made of solid brass. Hand made exclusively. Protect your key. Beautiful collection. Can give as a gift. Fashion to hang it with your bag or belt. For installation guide you can watch it in YouTube at the following link: https://www.youtube.com/watch?v=gZGLj9RL5aA. Can hold up to 10 keys depending on its thickness and length. Durable and long lasting. For free installation and adjustment please arrange with seller.