SteelSeries Glide FAQ:
Q: What does this product do?
A: The teflon tape, when attached to the feet of your mouse, reduces friction between the mouse and the mousepad. This makes the glide of the mouse much smoother, especially when used on mousepad made of a hard material like metal, glass or plastic.
Q: Why teflon?
A: Teflon offers what is arguable the lowest coefficient of friction in the world, this makes the material perfect for gaming. Teflon's coefficient of friction is the lowest of any known solid material (0.1 or less).