The Nissan Skyline is definitely a popular piece from Hot Wheels. Here I have 2 versions of the Skylines, one is black while the other is blue. However, if you look more closely you can see that the blue GT-R has a metal spoiler while the black GT-R has a plastic one. I'm guessing the blue GT-R's casting was retooled from the black GT-R's casting. Either way it's definitely a nice improvement!