^^^ for those who don't want to do the math, 216 balls is a 6x6x6 cube of balls.
I've seen a few comparisons on these vs zencube and other competitors. apparently bucky balls has a few failings which i've yet to find. there was a youtube video that compared the magnetic strength, geometric tolerances and coating finish. it's some guy with 3d glasses on that does the comparison and it's fucking hilarious that he adds the troll face somewhere in between telling the bucky ball maker to fuck himself. buckylols was added somewhere in that video too.
http://www.dhgate.com/wholesale/buckyballs/3.html
wholesale listing. this shit is awesome and wouldn't mind adding a few hundred more for an 8x8x8 cube.