The J,W, Harris 66000 Dynaflow Medium Silver PhosCopper Brazing Alloy is a brazing alloy that is used to join metals together. This alloy is made up of silver and copper, and is used to create joints that are strong and durable. This alloy is perfect for use in applications that require a strong and durable joint, such as aircrafts and automobiles. The J,W, Harris 66000 Dynaflow Medium Silver PhosCopper Brazing Alloy is a brazing alloy that is used to join metals together. This alloy is made up of silver and copper, and is used to create joints that are strong and durable. This alloy is perfect for use in applications that require a strong and durable joint, such as aircrafts and automobiles.