This HO scale International Style Hook and Loop Couplers are compatible with HO scale Thomas amp Friends products and many European prototype models. 3 Pairs includes hardware Please review all warnings and safety instructions printed on product prior to giving to any child Ages 8 The system uses the E Z Track System and is compatible with all HO electric trains. However, Thomas electric trains use a unique coupling system. NOTE Product is NOT compatible with the Thomas Take Along or Wooden Railway System.