Bearing is packed with heavy duty premium marine grease and with the addition of special complex thickeners which allows it to be virtually waterproof Nitrile butadiene rubber double-lip oil seals help prevent abrasives, corrosive moisture and other harmful contaminants from entering bearings To further help keep any moisture out, we have gone from 30% grease filling to a 60% for harsh conditions The special v-groove on the inner race is better for resistance to water intrusion Provides unsurpassed rust and corrosion protection Factory-Links ball bearings are specially designed for Off-Road use. - Honda TRX420FPE Rancher ES EPS 4x4 (2012, 2010, 2011, 2013, 2009); Honda TRX420FPM Rancher EPS 4x4 (2010, 2011, 2009, 2012, 2013); Honda TRX420 Rancher TM (2007, 2010, 2011, 2013, 2008, 2009, 2012); Honda TRX420 Rancher FE ES 4x4 (2009, 2013, 2011, 2008, 2010, 2007, 2012); Honda TRX420FM Rancher EFI 4x4 (2007, 2008, 2009, 2011, 2013, 2010, 2012); Honda TRX420 Rancher TE ES (2012, 2013, 2011, 2009, 2010, 2008, 2007)