Board Thread:General Nerf discussion/@comment-31275992-20171202215332/@comment-27306930-20180114021152

They are very similar. The heads on the Rads are actually two different sections held together by a thin membrane. The K'nex heads are solid through and through. Unlike K'lones and Waffles, you can't see through them.

Other than that, they're pretty much identical, except for the price.