Wire V/S Rod..!!duh..!

So back to a weird discussion amogst a few people..m the victim as usual..

I was wearing a small red bangle one fine day.A girl said hey i like your bangle.Like always compliments are always welcomed.i smiled back and said Thanku dear..but then as a habit now all want to take a closer look by taking it in their hand..ok fine..m in no mood to talk too much so i kept quiet and gave the bangle to them to ponder a little more over this timid soul.

In order to go ahead i should explain a little more about this bangle.Its a small metal ring over which a thread is wound..simple..

Now the girls have somthg to talk about engineering..

Somebody asks:Is this a plastic wire inside right?i said no its metallic..but then second somebody said hey dont be stupid its not a wire its a rod..

okey..i m confused..!what did u say??

now she explains:"a rod is a wire only when its diameter is smaller than its length..n its a rod when its not"...

n to this dare not to argue or question...

but m still confused.!!!