Ultimax® Pro delivers optimum performance and belt life to mid horsepower snowmobiles. Engineered specifically for your machine, Ultimax® Pro features a thicker cross section so more surface area contacts the clutch. This means less slippage over a broader speed range for quicker acceleration. The cog design provides strength, dissipates heat and aids flexibility delivering enhanced performance and longer belt life. Timken Belts Ultimax® Pro Drive Belt, 42-1/16 in Overall Length, 1-21/64 in Width, Rubber, Aramid Reinforced