Identifying various parts I bought a lot of various parts, but I can't seem to identify the following parts.

The grey wheels have rubber on one side of the axl hole
I'm thinking that that the black frame-thing isn't Lego, but wanted to be sure before tossing it.
The white wheels have circular holes, not axl holes.
I can't identify the black parts.

The toothed wheel is a string reel spool.

The rest of the parts appear to have come from a Robotics Invention System set from RCX-era Mindstorms:

The grey wheels with a different material on the inside are part 2983. None of those sets have 5 of these, though.
The grey bricks are touch sensors.
The white wheels are conveyer belt wheels.