Are these benningtons?

[Crazy4Marbles]

I picked these out of a box of marbles.  I believe they are some kind of clay marbles.  Also there is one little Steelie in there.  The Steelie has a bit of rust on it, should I clean that off of it or is it better to leave it as it is? 

[Steph]

In the first row, the middle one -- brown -- is a bennington.  

The one on the right with light blue splotches and other faint colors is probably also a bennington.  It would be called a "fancy bennington". 

  The rest are not benningtons. 

The ball-bearing variety of steelie has a certain charm but pretty much no value.    For most collectors the important thing to do with steelies is to make sure they aren't touch marbles they could damage.    Probably futile to try to clean it.

[wvrons]

A true steelie is hallow and will have a X crimp on one pole. Ball bearings have destroyed more marbles than people have playing marbles. Each time it hits against a marble it leaves a mark some slight some big.