What's the name of the plastic toy bones with different faces and colors from the early 2000's or late 90's?

i think it started with an I or something, i can't remember. there was a cheap version of them too, i think the real ones were more expensive. it may not have started with an i though....please help me!! it's bothering me like crazy!!What's the name of the plastic toy bones with different faces and colors from the early 2000's or late 90's?
they're called knuckle bones, theres also crazy bones

you can visit http://www.crazybones.com/