Teflon Mouse Feet

Because I use an aluminum mouse pad I have worn the little sliders on the bottom of my mouse pad down. Has anyone ever seen replacement ones? Or is there another remedy?

Theese would get the the mouse moving again, go to NOVA and you will find it.

http://www.everglide.com/index.php?option=com_content&task=view&id=17&Itemid=30