This is a Halcyon Eclipse wing with metal backplate and harness BCD, all hardware for a single tank. It is a standard size plate that is the stainless steel (6lb). This was purchased in 2009 after I studied/worked as a science diver with rented equipment for years. But after I purchased my own gear, I did not dive much. This BC has been on less than 10 dives. This was purchased new for $900. I am selling for 550, buyer pays shipping.