This is a package of HO scale #9 coupler with draft gear box that are metal. This package has 2 pair of couplers. The couplers are similar to the #5 except the center hole in the gear box is smaller. The couplers are used mostly on early Tyco metal trucks and wood craftsman type model kits. These couplers are made by Kadee and are made in the U.S.A.