This is the price for a set of two. The material is unknown, but it appears to be an alloy such as die-cast metal. Aging and changes over time may be difficult. If you are looking for a sense of weight and luxury, brass is recommended. Concho diameter: approximately 10mm. Screw head diameter: approximately 5mm. Leg length: approximately 3mm. Leg diameter: approximately 2.5mm. The image shows it used on leather approximately 3.5mm thick (the image is an example of attachment using a spring snap, the spring snap is not included). Although unused, there may be some scratches or dirt from manufacturing, so please be aware of this. We will ship with very simple packaging. Apollo Concho Sea Urchin Concho Individual sale is 580 yen each.