I have to admitt those cluster rings are probably the most silly thing I've ever purchased... but I really like them.
I'll look them up, I can't even remember the name of the place I got them from. They had two styles, chrome and brushed... which I figured they were both made of metal, so I bought the brushed. Once I recieved them I was a little dissapointed because I had just payed $40+ for six little rings of painted plastic. But I thought ah, what the heck, I'll put them in and see how they look. Turns out I thought they looked great. Some of my buddies don't like them... but the heck with them, I do.