What are these??? roller nuts??

What are these? i got them from a friend and i was wondering what they are and how they are place and such. i assume its a predecessor to the ball nut but im not sure.... the "ball" is two rollers connected to a wire the is springy like a ball nut.

Yer gonna die.

I wouldn't use them! i just wanna know what they are!

Rock n rollers.

Try contacting Jeff Lowe (Jello) at supertopo.com He'll know.

there's a description of it halfway down this page rockytopguides.com/blog/

Edit! - better link rockytopguides.com/blog/?p=212

The Loweball is a WAY better piece. Those rock n rollers make for good campfire discussion, but I wouldn't take them up El Cap or some desperate Tower route.
Sketch City, man.