Mother Clutcher made as a OE style Polaris primary (aka drive) and EBS tied removable helix secondary clutch made as an OE style and tuned specifically for 2016-2019 Sportsman 450 (all packages).
FITMENT: FITS ALL PACKAGES OF 2016-2019 Sportsman 450.*
Primary is an EBS style clutch, meaning It has a one-way bearing which adds EBS ( engine brake system) to some years that did not originally come with the feature. If you have certain L.E. models you already had this style clutch and it will perform same as your stock one. If another year or package Sportsman 450 you will feel that upgrade that it helps you slow down a little when you let off the gas which equals less wear on your brakes.
The secondary clutch is a tied style that comes on some Sportsman 500s with EBS but it is also a bolt-on upgrade for Sportsman 450 all years.