The K5 sintered compound is optimal for off-road dirt bikes and ATV. It is recommended for riders who demand great off-road stopping power and brake pad durability when riding on tough off-road terrain. Fits: Polaris ACE 500 2017-2021 ACE 900 XC 2018-2019 GENERAL 1000 EPS 2017-2018 GENERAL 1000 EPS DELUXE 2017-2021 GENERAL 1000 EPS PREMIUM 2017-2021 GENERAL 4 1000 EPS 2018-2020 OUTLAW 450 2008-2010 OUTLAW 525 IRS 2008-2011 OUTLAW 525 S 2008-2010 RANGER XP 1000 HD EPS 2019-2020 RZR 570 EFI 2012-2014 RZR 800 2008-2009 2011-2012 RZR 800 Built 1/01/10 and after 2010 RZR 800 Built 12/31/09 and Before 2010 RZR 900 EPS 2018-2020 RZR 900 EPS TRAIL 2017