POLARIS SPORTSMAN 500 EBS PRIMARY DRIVE CLUTCH. THIS CLUTCH ASSEMBLY COMES COMPLETE WITH NEW WEIGHTS & A NEW SPRING. NO ADDITIONAL WORK IS NEEDED TO PUT IN YOUR OLD WEIGHTS & OLD SPRING WHICH BY NOW WOULD PROBABLY BE WORN & DAMAGED. EVERYONE OF OUR CLUTCHES IS BALANCED CORRECTLY WITH THE NEW WEIGHTS & SPRING. THIS CLUTCH IS EQUAL TO OR BETTER THAN OEM CLUTCH. A, NOT LIKE SOME SELLERS WHO SAY THEY DO BUT DON'T.