Small pulleysThe cogs let the belt bend round smaller pulleys than a smooth belt without overheating or cracking, so it suits compact drives.
More powerOn an existing drive, a Super XE-Power PRO belt can carry more load or last longer. On a new drive, you may be able to use fewer belts.
Same pulleysXP belts run in the same pulleys as SP belts of the same section: an XPZ belt fits SPZ pulleys, an XPB fits SPB, and so on.