Factory Spec severe duty brake pads are made of a sintered bronze compound. Their exclusive high-density mix extends pad life for use in extreme conditions such as sand, mud, water and farm usage. If long life is your main concern, these brake pads are your best choice. They will last much longer than any semi-metallic or organic brake pad on the market. Manufactured by Factory Spec Included is two sets of brake pads, as pictured This is enough to replace the pads on the front calipers Made in China These sintered metal brake pads fit the following models 1997 Polaris Scrambler 500 4x4 1998 Polaris Scrambler 500 4x4 1999 Polaris Scrambler 500 4x4 2000 Polaris Scrambler 500 4x4 2001 Polaris Scrambler 500 2x4 2001 Polaris Scrambler 500 4x4 2002 Polaris Scrambler 500 2x4 2002 Polaris Scrambler 500 4x4 2003 Polaris Scrambler 500 4x4 2004 Polaris Scrambler 500 4x4 2005 Polaris Scrambler 500 4x4 2006 Polaris Scrambler 500 4x4 2007 Polaris Scrambler 500 4x4 2008 Polaris Scrambler 500 4x4 2009 Polaris Scrambler 500 4x4 2010 Polaris Scrambler 500 4x4 2011 Polaris Scrambler 500 4x4 2012 Polaris Scrambler 500 4x4