The reduction of the friction provides improved accuracy when playing and working with your mouse. So you can nearly belive that the mouse flies without any resistance over the Mousepad. Corepad Skatez PRO 57 Mouse-Feet Cooler Master CM Storm Spawn / Xornet / Xornet II / III.
Pretty much the only replacement feet for the Spawn/Xornet, but regardless, they're very nice quality. And the fact it comes with 2 sets is really nice. Buy once and you're set.