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LMR400 has a copperclad aluminum center conductor. LMR400 is often considered a modern replacement for older Belden 9913. LMR400 is lighter in weight and easier to manufacture. However, at most frequencies the Belden 9913 has a tiny advantage in slightly less loss compared to LMR400. The LMR400 dielectric is basically foam which makes it more rugged than Belden 9913. LMR400 has a copperclad aluminum center conductor. LMR400 is often considered a modern replacement for older Belden 9913. LMR400 is lighter in weight and easier to manufacture. It is also more flexible making it somewhat easier to work with. However, at most frequencies the Belden 9913 has a tiny advantage in slightly less loss compared to LMR400. The LMR400 dielectric is basically foam which makes it more rugged than Belden 9913.