It’s hollow but reinforced (if that makes sense. Picture attached). My friend has a biggest size (not width, i have 15 and she has 17) and it’s not reinforced inside. It’s held up very well. It’s scratched on the underside, which isn’t fluted. But it’s not bad at all…and no one can see the underside anyway. I don’t see any scratches or dents on the fluted side. If they’re there, they aren’t noticeable due to the texture. I’ve had it since February and wear it almost daily. Maybe in 5 years it’ll look beat up? But definitely holds up better than the Love bracelet.
Also wanted to add that size 15 in the RC coincides with size 16 small Love.