Kangin and his bracelet

I've checked some pict of Kangin and I found that he likes to wear this one bracelet
But not sure whether it's just an ordinary accessory or have a sentimental meaning
(he's just not wearing it all the time)

Ryeowook going to marry Donghae oppa~

Donghae: Ah… Ryeowook said he was going to marry me..
Kangin: Really?
Ryeowook: Yeah, I want to marry Donghae.
Kangin: Why?
Donghae: No, there was a question.. IF Ryeowook was a girl which one of the members would he marry, and he said me.
Kangin: Why?
Donghae: ..Why?
Ryeowook: Do I have to reveal it here?
Donghae: Reveal it.
Kangin: Say it.