off-topic mouse question

[Tim]

Does anybody know of a mouse with a scroll wheel that's not rubber
coated?  I have a latex allergy, getting really sick of the skin
irritation, and I'm not having a great deal of luck researching this. 
Most mice don't state what they're made of.

Yes, I do want a scroll wheel mouse and not a trackball.  They have
their purposes, but don't suit what I generally want to do.