Piece identification (Sphere) I was wondering if this LEGO piece is a valid LEGO, and what is its part number?
Can it be used in FIRST LEGO League competitions?
It looks like there are three individual pieces. 


A small metal ball (Probably not LEGO)
A translucent connector (Probably not LEGO)
A red LEGO Technic Cross Axle (6538)




The red piece seems to share the same amount of ridges ridges (three) and seems to be a good match in size and colour. I'm not familiar with this connector being used in this manner, I'm fairly sure the other two pieces are not LEGO.