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 455 DIESEL 4x4 2000-2001 455 DIESEL 4x4 (after 9/98) 1999 455 DIESEL 4x4 (before 9/98) 1999 MAGNUM 325 (2WD) 2000-2002 MAGNUM 325 (4WD) 2000-2001 MAGNUM 325 4x4 2002 MAGNUM 325 4x4 HDS 2000-2001 MAGNUM 500 2x4 1999-2001 MAGNUM 500 4x4 1999-2001 RANGER 500 4x4 2001-2003 SCRAMBLER 400 2x4 2000-2002 SCRAMBLER 400 4x4 1998-2002 SCRAMBLER 500 2x4 2000-2006 SCRAMBLER 500 4X4 1998-2004 SPORTSMAN 335 1999-2000 SPORTSMAN 400 4x4 2001-2002 SPORTSMAN 400 4x4 before 12-7-00 2001 SPORTSMAN 500 4x4 DUSE 2001-2002 SPORTSMAN 500 4x4 RSE 2000-2002 SPORTSMAN 500 4x4 RSE (after 9/98) 1999 SPORTSMAN 500 4x4 RSE (before 9/98) 1999 TRAIL BLAZER 250 1999-2006 TRAIL BLAZER 250 2x4 2006 TRAIL BLAZER 400 2x4 2003 TRAIL BOSS 325 2x4 2000-2002 TRAIL BOSS 330 2x4 2003-2004 XPLORER 250 4x4 1999-2002 XPLORER 400L 4x4 2000-2002 Xpedition 325 2000-2001 Xpedition 425 2000-2002