they are individual track links, the pads are rubber, ive looked at them in a shop but havnt bought any becouse the box they come in is 30 times bigger than it needs to be
Fruimodel make a set that are metal and go together the same way
ive got a set of metal 251 tracks made by F&F Models i dont know how good they go together becouse there still in there bag
i dont know where to start with them