Fit for 30 Series (Red spring)Note this will not work with a 20 series setup.
Tension Spring for Driven Pulleys.
Package includes:Red 30 series spring,Comes with 6 wear buttons.
It Was able to tune the clutch depending on what terrain you are riding on.
Note:If the buttons are slightly too large for the holes of your driven unit. With a little bit of sanding and light tapping from a small hammer they fit right in.