Ultimax 3 has evolved into Ultimax Pro Belt features a thicker cross section so more surface area contacts the clutch; this means less slippage over a broader speed range for quicker acceleration New cog design dissipates heat and aids flexibility Cooler running belts mean better performance and longer lasting belts Run cool, run long, run fast with Ultimax Pro This item fits the following applications: 2008-2010 Ski-Doo Skandic 550F WT 2009 Ski-Doo Skandic V-800 SWT 2007-2008 Ski-Doo Expedition Sport V-800 2005-2008 Ski-Doo Expedition TUV 600 2008 Ski-Doo Skandic 600 WT 2005-2006 Ski-Doo Expedition TUV V-1000