We have four types of the flux cored wire for copper to aluminum brazing. The flux cored wire XR-FC20A and XR-FC20AW (seamless) are silver contained. The flux cored wire XR-FC0215 and XR-FC0215W (seamless). And the working temperature of them are about 420-480. Also we have the separated material as brazing wire (XR-BW200, XR-BW15A Silver contain) and flux paste FS312C.