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: Honda SXS500M2 Pioneer 500 2014-2021 SXS700M2 Pioneer 700 2 2014-2021 SXS700M4 Pioneer 700 4 2014-2021 TRX420FA IRS 4WD RANCHER 2009-2013 TRX420FA2 4X4 DCT FOURTRAX RANCHER 2017-2020 TRX420FA6 IRS 4WD RANCHER 2015-2020 TRX420FA6L IRS 2021 TRX420FPA IRS 4WD RANCHER 2009-2014 TRX420FPE FOURTRAX RANCHER 2011-2013 TRX450ER 2WD 2006-2016 TRX450R 2WD 2004-2009 TRX500FA6 IRS 2014-2020 TRX500FA7 IRS 2015-2020 TRX500FM6 IRS 4X4 FOREMAN RUBICON 2014-2020 TRX520FA6 IRS 2020 TRX520FA6L 2021 TRX520FM6 IRS 2020 TRX650FA IRS RINCON 4WD 2003-2005 TRX680FA IRS RINCON 2012-2013 TRX680FA IRS RINCON 4WD 2006-2014 TRX680FA IRS RUBICON 4WD 2015-2021 TRX680FGA RINCON 2007-2013