Shaper Bars - 4.5in. For 2003 Arctic Cat Mountain Cat 900 1M Snowmobile The first major breakthrough in wear bar technology since the 1950sUnique corner-carving hourglass design yields better control at speed with no increased steering effortBetter tracking on trailshourglass wear bar shape catches snow from ski sides to make steering more positiveAverage of 1 - 2 tighter turning radius in soft snow conditions20% lighter than conventional 1/2 diameter round wear barsZinc-plated for corrosion re_sistanceLifetime wear rate is nearly equal to current round and square wear bar typesManufactured by Designed and tested by USISold in pairs Shaper Bars - 4.5in.Shaper Bars - 4.5in.*Studboy*Sold Each - Order Quantity Appropriate For Your Machine.